What is halite

Halite (/ˈhælaɪt, ˈheɪlaɪt/), commonly known as rock salt, is a type of salt, the mineral (natural) form of sodium chloride (NaCl). Halite forms isometric crystals. The mineral is typically colorless or white, but may also be light blue, dark blue, purple, pink, red, orange, yellow or gray depending on inclusion of other materials, impurities, and structural or isotopic abnormalities in ...

What is halite. Halite. Synonym: ICSD 18189. Murate of Sota. PDF 5-628. Rock Salt. Sodium Chloride. Halite Image. Images: Halite. Comments: Hoppered pink halite crystals from the evaporation ponds. The pink color is due to the organism Halo bacterium that lives in the concentrated brine. Location: Searles Lake, Trona, San Bernadino County, California, USA.

The meaning of HALITE is salt that is in the form of large pieces or crystals : rock salt. How to use halite in a sentence.

Display the halite crystal to the class. If it is a large class, use the document projector. The sample may be passed around if time allows. Turn on the power strip. Carefully hold the crystal against the leads of the conductivity tester. Do not touch the leads! Severe shock could result! The conductivity tester does not light up. Turn off the ...Limonite is extremely common and forms the coloring matter in many soils. It is also responsible for the coloring on the weathered surfaces of rocks. Much Limonite, especially the fibrous type, is either Goethite or alter ed Goethite that absorbed water in its chemical structure. Limonite commonly forms as a pseudomorph over other minerals ...Halite may be deliquescent (absorb water and turn into a liquid under extreme humidity. Halite comes in just about any color; Figures 14.302 and 14.303 show pink and green varieties. The pink halite crystals in Figure 14.322 are hopper crystals, which means that their edges grew faster than the centers of faces.31 sie 2015 ... Halite (salt) - is naturally formed, is solid, does have a definite chemical composition that can be expressed by the formula NaCl, and does ...Howlite is a white-colored gemstone. It has a beautiful white shade with different alluring patterns. The crystal is used for making interesting artifacts and a wide range of pieces of jewelry. Spiritual practices around the world require howlite crystal and the stone has powerful metaphysical and healing properties.

Rock Salt Halite Mineral. Price: $4.79. SKU: MIN9039. Add to Cart. Rock salt is composed of the mineral halite which is sodium chloride, or NaCl. Samples of rock salt can be white, clear, blue, pink, yellow, red and purple. On the Mohs Hardness Scale of 1 to 10, rock salt is a 2.5, which means it is a very soft mineral that is approximately the ...Hytale combines the scope of a sandbox with the depth of a roleplaying game, immersing players in a procedurally generated world where teetering towers and deep dungeons promise rich rewards. Hytale supports everything from block-by-block construction to scripting and minigame creation, delivered using easy to use and powerful tools.Halite can precipitate as brine with sodium and chlorite ions flows to the cooler environment. Salt cementation of reservoir rocks leads to decreasing porosity ...Halite. Halite is a common evaporite mineral, NaCl, used as table salt worldwide. It is arguably the most well-known mineral in the world. It has a formula ...D. halite, halogen. number of valence electrons. The columns of the periodic table divide atoms by their ________. A. atomic mass. B. number of protons. C. number of neutrons. D. number of valence electrons. The planar faces that form the object are crystal faces that grow when the crystals grew into a void. Quartz has a characteristic ...Halite is crystallized first by evaporating the recovered brine, then potash (a prograde salt) is recovered by cooling the remaining hot, saturated solution. Carnallitite, like trona, shows incongruent solubility so that in beds composed of mixtures of carnallite, sylvite and halite, the sylvite tends to be left behind as a less soluble component that can slow the rate of …Nov 26, 2018 · Halite Structure. Halite features an isometric (cubic) crystal system, which simply means that the crystals in the mineral contain three axes that are all equal lengths and stand at 90 degrees from each other. Halite is a sodium chloride. Both atoms are regularly distributed within the cubic crystal lattice.

halite. Which evaporite mineral can be scratched by your fingernail and is found in many buildings as drywall. gypsum. false teeth, ceramics and scouring powders are made from this hard mineral, which has cleavage in 2 directions. potassium feldspar.The primary mineral within crystalline limestone is halite. False. Coal beds originate in ________. freshwater coastal swamps and bogs. ________ is the parallel alignment of different mineral bands in a metamorphic rock. Foliation. An igneous rock with a Felsic mineral composition is rich in dark-colored minerals like olivine and pyroxene. False.Halite, or rock salt as it is more commonly known, is the mineral form of Sodium Chloride (NaCl). It is an evaporite mineral, meaning it forms through the.Two commercially important halide minerals are halite and fluorite. The former is a major source of sodium chloride, in parallel with sodium chloride extracted from sea water or brine wells. Fluorite is a major source of hydrogen fluoride, complementing the supply obtained as a byproduct of the production of fertilizer. Carnallite and ...Anhydrite can be a small challenge to identify when it occurs in massive form. It can be confused with gypsum, calcite, or halite - which it is almost always associated with. Compared to gypsum, anhydrite exhibits cleavage in three directions at right angles and has a greater hardness. Calcite’s unique properties and widespread occurrence make it valuable in a variety of industrial and practical applications. Its versatility is evident in fields ranging from construction to manufacturing to environmental protection. Here are some of the key industrial and practical uses of calcite: 1.

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Table salt is the name for the mineral halite, which is the mineral substance sodium chloride. This mineral belongs to the group of non-silicate minerals that make up only 8 percent of the Earth's crust. There are several groups of non-silicate minerals such as carbonates, halides, oxides, sulfides, or sulfates.Salt/Halite Uses. Over 40% of salt is used in the chemical industry (mainly for the preparation of sodium hydroxide, soda ash, hydrochloric acid, chlorine and metallic sodium) and another 40% as a de-icer on roads in winter. The remaining is consumed in several sectors, including manufacture of rubber and other goods, agriculture, and food ...Halite is a type of mineral (rock). Often is used for road salt.Some readers may also be familiar with the similar term halite, spelled with a "t" as opposed to a "d." Halite is the mineral form of NaCl that's also known as rock salt. It's regularly used in winter climates to melt snow and ice from walkways and roadways. Where and why are they used? In broad terms, halogens are associated with ...

what is the symbol for halite. Is halite a carbonate? No, halite is a chloride. The cougar is a member of which family? the cougar is a member of which family. What family is the Katydid a member of?As nouns the difference between salt and halite is that salt is a common substance, chemically consisting mainly of sodium chloride (NaCl), used extensively as a condiment and preservative while halite is native salt; sodium chloride NaCl as a mineral; rock salt. As an adjective salt is salty; salted. As a verb salt is to add salt to. As an initialism SALTHalite, also known as rock salt or sodium chloride (NaCl), is a naturally occurring mineral that holds significant importance in various aspects of human life. This crystalline mineral is composed of equal parts sodium and chlorine ions and is renowned for its distinctive cubic crystal structure.Researchers looking at ancient Australian halite cores have reported 830-million-year-old microbes inside the rock salt crystals -- and they think some of the microbes might even be alive. The ...Placing halite onto sidewalks, driveways, and roads can prevent these surfaces from developing icy conditions because the mineral will melt the ice. Adding it to roadways can help break up ice, giving vehicles better traction. Some communities mix rock salt with sand to melt ice and create vehicle traction at the same time.4 paź 2020 ... Halite is the mineral name for the substance that everyone knows as "salt." Its chemical name is sodium chloride, and a rock composed primarily ...A) breccia has a compacted, clay-rich matrix; conglomerate has no matrix. B) breccia clasts are the size of baseballs; conglomerate clasts are larger. C) breccia clasts are angular; conglomerate clasts are rounded. D) a breccia is well stratified; a conglomerate is poorly stratified.For halite, most people would describe it as a glassy or vitreous luster. Which of the minerals listed below has non-metallic luster and can have the shape of little cubes? Halite.A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides [1] [2] (compounds of metals with bromine or iodine ). It is a type of high-intensity discharge (HID) gas discharge lamp. [1] Developed in the 1960s, they are similar to mercury vapor lamps, [1] but ...A mineral with four directions of cleavage is termed octahedral. With 2 or more cleavage planes present, it is important to pay attention to the angle of the cleavage planes. To determine the angle of cleavage, look at the intersection of cleavage planes. Commonly, cleavage planes will intersect at 60°, 90° (right angles), or 120°.

Halite is more commonly known as rock salt. It is a mineral, not a gem, which can be found in lavender, white, and clear crystal-like specimens. What does Halite fracture look like?

What is Rock Salt? Most of the salt we use in cooking, both table salt and Kosher salt, is made by flooding underground salt deposits with freshwater, extracting the water and then evaporating it to leave the pure salt crystals behind. A smaller proportion, which is known as sea salt, is produced by evaporating the salt from seawater.The Woodsmith potash mine near Whitby, North Yorkshire, England, is set to be the world’s biggest and highest-grade polyhalite project. Sirius Minerals owns the £3.2bn ($4.19bn) project under the subsidiary trading name of York Potash. The mine is anticipated to reach a production capacity of 13 million tons per annum (Mtpa) in 2026 and ...2.6: Classes of Minerals. Minerals are classified according to their chemical properties. Except for the native element class, the chemical basis for classifying minerals is the anion, the negatively charged ion that usually shows up at the end of the chemical formula of the mineral. For example, the sulfides are based on the sufur ion, S 2–.Calcite is number 3 on the Mohs hardness scale; thus, it can be scratched readily by a knife blade or geologic pick. It has a specific gravity of 2.71. Three perfect cleavages give calcite its six-sided polyhedrons with diamond-shaped faces; the angles defining the faces are 78° and 102°. The three important crystal habits (distinctive shapes ...Salt/Halite Uses. Over 40% of salt is used in the chemical industry (mainly for the preparation of sodium hydroxide, soda ash, hydrochloric acid, chlorine and metallic sodium) and another 40% as a de-icer on roads in winter. The remaining is consumed in several sectors, including manufacture of rubber and other goods, agriculture, and food ...Halite is salt. In its natural form, it's called rock salt. Halite is found in sedimentary rocks. It is called an evaporite mineral because it formed in ancient seas and salt lakes as they slowly evaporated millions of years ago. As the water evaporated, thick deposits of salt were left behind. This process still goes on today.Other articles where halide is discussed: halogen: Oxidation: …to form compounds known as halides—namely, fluorides, chlorides, bromides, iodides, and astatides. Many of the halides may be considered to be salts of the respective hydrogen halides, which are colourless gases at room temperature and atmospheric pressure and (except for hydrogenHalite is sodium chloride, sodium chloride is halite, really the only difference is how you're using them and what you're referring to. NaCl occurs naturally in great abundance (sea water, mineral deposits, endorheic lakes like the Great Salt Lake), I'm sure we can create it in a lab and it is probably done somewhere, but it's such a common ...

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Store. AAPG Store. Lithological determination from wireline logs is often done by sophisticated computer programs, but basic quick-look interpretation can be made by visual inspection of appropriate logs. The best logs for lithological purposes are those that are (1) most influenced by rock properties and (2) least influenced by fluid properties.Halite. Halites are evaporitic rocks that contain more than 95% NaCl, and as such they can be considered as poly-extreme habitats, coupling hyper-salinity with high temperatures, extremely low water activity, and high levels of UV radiation. From: Reference Module in Earth Systems and Environmental Sciences, 2022. Salinity. Halite is typically found in sedimentary rocks and is formed with the evaporation of saltwater and seawater. At times, halite can be formed when entire saltwater lakes or enclosed lakes dry up to leave behind salt deposits. Halite salt beds can also be formed in areas where there's low precipitation, such as in areas like the Badwater Basin ...Palo Alto Interview questions. Rating: 4.6. To protect against security risks in this internet age, it's critical to ensure that your organization is adequately secured across networks, cloud, and mobile devices. Palo Alto Networks' integrated platform makes it simple to manage network and cloud security, as well as endpoint protection with a ...Evaporite minerals form by coming out of a solution where seawater and the waters of large lakes evaporate. Rocks made of evaporite minerals are sedimentary rocks called evaporites. Halides are chemical compounds that involve the halogen (salt-forming) elements fluorine and chlorine. The heavier halogens, bromine and iodine, make quite rare and ...Halite is called an evaporite because it is formed by the evaporation of saline water in partially enclosed basins. It is very common worldwide, deposited in ...Halite. Blue halite from Germany is the result of exposure to natural radiation. Initially, if halite (common salt) is exposed to gamma radiation, it turns amber because of F-centers. They are mostly electrons trapped at sites of missing Cl-ions. In time the electrons migrate to Na + ions and reduce it to Na metal. Atoms of Na metal, in turn ...The Mohs Hardness Scale is a set of ten reference minerals (numbered 1 through 10) that are used to determine the relative hardness of minerals and other objects. In this test the hardness of a mineral is defined as its "resistance to being scratched". A list of the Mohs Hardness Scale Minerals is shown in the table below.Pyrite is a brass-yellow mineral with a bright metallic luster. It has a chemical composition of iron sulfide (FeS 2) and is the most common sulfide mineral. It forms at high and low temperatures and occurs, usually in small quantities, in igneous, metamorphic, and sedimentary rocks worldwide.Limonite is extremely common and forms the coloring matter in many soils. It is also responsible for the coloring on the weathered surfaces of rocks. Much Limonite, especially the fibrous type, is either Goethite or alter ed Goethite that absorbed water in its chemical structure. Limonite commonly forms as a pseudomorph over other minerals ...What is halite? A mineral containing sodium and chlorine that forms when water evaporates. Table salt; What happens when you drop acid on a carbonate mineral (or rock)? Material fizz and will dissolve, releasing CO 2; What is the composition of diamonds and graphite? Why are they showing very different physical properties? Carbon. ….

The strength of the halite specimens is less than the anhydrite interlayers, and the strength of the anhydrite-halite composite lithotype is intermediate; however, because of the small number of specimens and the close nature of these data, specific conclusions cannot be drawn except to say that the UCS strengths of the three lithotypes are ...Halite and sylvite commonly form as evaporites, and can be dominant minerals in chemical sedimentary rocks. Cryolite, Na 3 AlF 6, is a key mineral in the extraction of aluminium from bauxites; however, as the only significant occurrence at Ivittuut, Greenland, in a granitic pegmatite, was depleted, synthetic cryolite can be made from fluorite.Halite is the mineral form of sodium chloride, NaCl, commonly known as rock salt. Halite forms isometric crystals. The mineral is typically colourless to yellow ...Halite Properties and Meaning. Halite is a member of the Halide family. It comes in both massive and crystalline form, displaying many colors. This mineral is readily available. Read more about Halite healing properties information and view photo galleries below complete with high resolution images.Entered price. The entered price of “Halite” per 9 ounces is equal to 4.99. About Halite. Halite weighs 2.17 gram per cubic centimeter or 2 170 kilogram per cubic meter, i.e. density of halite is equal to 2 170 kg/m³; at 20°C (68°F or 293.15K) at standard atmospheric pressure . In Imperial or US customary measurement system, the density ...Halite is a common or rock salt that occurs on all continents in beds formed by the evaporation of saline water. Halite has various forms, colors, and properties, such as crystals, fractures, and cleavages.Blue Halite, also known as blue rock salt, is an extremely rare variety of crystallized sodium chloride. It usually occurs in a cubic form but has also been found as masses, grains, and tiny shards. The galactic color spectrum Blue Halite offers is due to minor impurities of potassium within the salt’s chemical composition.2.4 Silicate Minerals. The vast majority of the minerals that make up the rocks of Earth’s crust are silicate minerals. These include minerals such as quartz, feldspar, mica, amphibole, pyroxene, olivine, and a great variety of clay minerals. The building block of all of these minerals is the silica tetrahedron, a combination of four oxygen ... Natural halites whose color ranges from transparent to dark blue were studied by UV-VIS and Raman spectroscopy. The halite crystals were irradiated with 3 MeV ... What is halite, As already noted, crystal surfaces are related to how a mineral grows while cleavage planes are related to how it breaks. In most minerals cleavage planes and crystal surfaces do not align with one-another. An exception is halite, which grows in cubic crystals and has cleavage along those same planes (Figure \(\PageIndex{1}\) and 2.2.6)., Minerals form when atoms bond together in a crystalline arrangement. Three main ways this occurs in nature are: 1) precipitation directly from an aqueous (water) solution with a temperature change, 2) crystallization from a magma with a temperature change, and 3) biological precipitation by the action of organisms., Fluorite has a wide variety of uses. The primary uses are in the metallurgical, ceramics, and chemical industries; however, optical, lapidary, and other uses are also important. Fluorspar, the name used for fluorite when it is sold as a bulk material or in processed form, is sold in three different grades (acid, ceramic, and metallurgical)., Halite, commonly known as , is a type of salt, the mineral (natural) form of sodium chloride (NaCl). Halite forms isometric crystals. The mineral is typically colorless or white, but may also be light blue, dark blue, purple, pink, red, orange, yellow or gray depending on inclusion of other materials, impurities, and structural or isotopic ..., Hematite is the world's most important ore of iron. Although magnetite contains a higher percentage of iron and is easier to process, hematite is the leading ore because it is more abundant and present in deposits in many parts of the world. Hematite is mined in some of the largest mines in the world., Halide mineral, any of a group of naturally occurring inorganic compounds that are salts of the halogen acids (e.g., hydrochloric acid). Such compounds, with the notable exceptions of halite (rock salt), sylvite, and fluorite, are rare and of very local occurrence. Compositionally and. , As a consequence, gypsum typically occurs as layers associated with limestone, dolostone, shale, and rock salt. As seawater evaporates, gypsum is the first ‘salt’ to be precipitated, followed by anhydrite, halite, and finally sylvite. Usually found with other evaporite and carbonate minerals, such as anhydrite, calcite, dolomite, borax, and ... , Halite is a type of salt, the mineral form of sodium chloride, that forms isometric crystals. It occurs within sedimentary rocks where it has formed from the evaporation of seawater or salty lake water. It is used for cooking, de-icing, and other purposes. Learn more about its properties, occurrence, mining, and uses., The mineral halite is non-metallic. What is the crystal structure for halite? the crystal structure of halite is basically a crystal structure the is made out of repeating boxes, 'Ore' refers specifically to a mineral or group of minerals utilized for the purpose of extracting metals. Halite is a mineral with the composition NaCl, and is non-metallic., Halite is a PHP library that offers a simplified interface to using the PHP extension for libsodium . Halite emphasizes simplicity without sacrificing any of the security that libsodium offers. Halite is free software, released under GPLv3. If you require a non-GPL commercial license for your project, please get in touch ., salt dome, largely subsurface geologic structure that consists of a vertical cylinder of salt (including halite and other evaporites) 1 km (0.6 mile) or more in diameter, embedded in horizontal or inclined strata.In the broadest sense, the term includes both the core of salt and the strata that surround and are "domed" by the core. Similar geologic structures in which salt is the main ..., Halite Metaphysical Properties and Benefits. Halite is a common salt, but that doesn't mean it's any less sacred. It's one of the few crystals that open all the major chakras in the body, as Halite crystals exist in many colors. Halite is ruled by the Aztec Goddess of Fertility, Huixtocihuatl; Nanshe, the Persian Goddess of Justice ..., Halite. Synonym: ICSD 18189. Murate of Sota. PDF 5-628. Rock Salt. Sodium Chloride. Halite Image. Images: Halite. Comments: Hoppered pink halite crystals from the evaporation ponds. The pink color is due to the organism Halo bacterium that lives in the concentrated brine. Location: Searles Lake, Trona, San Bernadino County, California, USA., Chemical Sedimentary Rocks. Sedimentary rocks formed by the crystallization of chemical precipitates are called chemical sedimentary rocks. Dissolved ions in fluids precipitate out of the fluid and settle out, …, Salt deposits beside the Dead Sea. In common usage, salt is a mineral composed primarily of sodium chloride (NaCl). When used in food, especially at table in ground form in dispensers, it is more formally called table salt.In the form of a natural crystalline mineral, salt is also known as rock salt or halite. Salt is essential for life in general, and saltiness is one of the basic human tastes., 2.3 Mineral Groups Most minerals are made up of a cation (a positively charged ion) or several cations and an anion (a negatively charged ion (e.g., S 2–)) or an anion complex (e.g., SO 4 2–). For example, in the mineral hematite (Fe 2 O 3), the cation is Fe 3 + (iron) and the anion is O 2– (oxygen). We group minerals into classes on the basis of their …, Halite is also often used both residentially and municipally for managing ice. What is mica used for? The major uses of sheet and block mica are as electrical insulators in electronic equipment, thermal insulation, gauge "glass", windows in stove and kerosene heaters, dielectrics in capacitors, decorative panels in lamps and windows ..., C. Three cleavages: Galena, halite, gypsum, calcite, dolomite. Galena, and halite have cubic cleavage, the former being metallic and dense, the latter non-metallic, of low density, and soluble. Calcite and dolomite have very perfect rhombohedral cleavage. Gypsum has one perfect cleavage with a glassy luster, one less perfect with a , Smoky quartz with spessartine on top of feldspar matrix, featuring different crystal habits (shapes). In mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals. The habit of a crystal is dependent on its crystallographic form and growth conditions, which generally creates irregularities due to limited space in the crystallizing medium ..., Pink Halite Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. Science & Origin of Pink HalitePink Halite is a type of Halite that had its color tainted from bacteria of various algae species. Halite is known as the "natural form of salt" and is a very common mineral found near oceans and salt lakes. This stone can be found in the form of masses and a tubular crystal structure., Howlite is a white-colored gemstone. It has a beautiful white shade with different alluring patterns. The crystal is used for making interesting artifacts and a wide range of pieces of jewelry. Spiritual practices around the world require howlite crystal and the stone has powerful metaphysical and healing properties., salt dome, largely subsurface geologic structure that consists of a vertical cylinder of salt (including halite and other evaporites) 1 km (0.6 mile) or more in diameter, embedded in horizontal or inclined strata.In the broadest sense, the term includes both the core of salt and the strata that surround and are “domed” by the core. Similar geologic structures in …, b. Use toothpicks to connect the red balls in one chain to the red balls in the other chain. c. Use purple balls to represent metal ions, and use toothpicks to connect the purple balls to each chain. d. Use purple balls to represent metal ions, and replace some of the red and grey balls with purple balls. Earth’s ocean crust is dominated by: a., An exception is halite, which grows in cubic crystals and has cleavage along those same planes (Figure \(\PageIndex{1}\) and 2.2.6). But this doesn't hold for most minerals. Quartz has crystal surfaces but no cleavage at all. Fluorite forms cubic crystals like those of halite, but it cleaves along planes that differ in orientation from the ..., Pyrite is a brass-yellow mineral with a bright metallic luster. It has a chemical composition of iron sulfide (FeS 2) and is the most common sulfide mineral. It forms at high and low temperatures and occurs, usually in small quantities, in igneous, metamorphic, and sedimentary rocks worldwide. , Mineral Group: Halite belongs to the mineral group of the Halides or Halogenides. Halides, along with borates and nitrogens, are minerals that combine with the halogen elements, boron and nitrogen. Beside halite, other examples include fluorite, sylvite, and borax (4). Halite is also an evaporite., The properties of calcite make it one of the most widely used minerals. It is used as a construction material, abrasive, agricultural soil treatment, construction aggregate, pigment, pharmaceutical and more. It has more uses than almost any other mineral. Calcite in the form of oolitic limestone from Bedford, Indiana. , Halite - Business Information. Manufacturing · Norway · <25 Employees. Born in Norway. Halite products are meticulously designed, refined for form, fit and function.Working with personnel from leading special operations forces, we have been quietly supplying bags designed for Maritime Operations for many years., Halite is just salt in its natural form. As a crystal, it usually occurs colorless or white, but it can be other pretty colors, too. You may not have heard of halite crystal, but you're definitely familiar with rock salt, right? While it's a very common mineral, halite is rarely faceted as a gemstone., Sep 1, 2023 · What is Rock Salt? Most of the salt we use in cooking, both table salt and Kosher salt, is made by flooding underground salt deposits with freshwater, extracting the water and then evaporating it to leave the pure salt crystals behind. A smaller proportion, which is known as sea salt, is produced by evaporating the salt from seawater. , Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These include annite, phlogopite, siderophyllite, fluorophlogopite, fluorannite, eastonite, and many others. These micas vary in chemical composition but are all sheet silicate minerals with very similar physical properties., In Our Earth: The Geologic Importance of Biotite. A common, widespread, rock-forming mineral, biotite is a significant mineral in granites, diorites, and igneous pegmatites. In pegmatites, biotite crystals can be very large. It also occurs in schists, gneisses, and hornfels that resulted from either regional or contact metamorphism.