Calcite Mineral Britannica
Quartz | Definition, Types, Uses, & Facts | Britannica
Quartz has great economic importance. Many varieties are gemstones, including amethyst, citrine, smoky quartz, and rose quartz. Sandstone, composed mainly of quartz, is an important building stone.Large amounts of quartz sand (also known as silica sand) are used in the manufacture of glass and ceramics and for foundry molds in metal casting. Crushed …
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mineral
Encyclopædia Britannica, Inc. ... Among these is the plentiful mineral called calcite, or calcium carbonate. Large transparent crystals of calcite are called Iceland spar. This chemically pure, clear calcite—capable of producing double …
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calcite
Calcite is the most common form of natural calcium carbonate. It is a widely distributed mineral known for the beautiful development and great variety of its crystals. Articles ... ©2024 Encyclopædia Britannica, Inc. By continuing to use this site, ...
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Mineral
Mineral - Classification, Properties, Types: Since the middle of the 19th century, minerals have been classified on the basis of their chemical composition. Under this scheme, they are divided into classes according to their dominant anion or anionic group (e.g., halides, oxides, and sulfides). Several reasons justify use of this criterion as the distinguishing factor at …
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Calcite Mineral | Uses and Properties
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, …
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stalactite and stalagmite
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and …
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Siderite | Iron Carbonate, Carbonate Minerals, Sedimentary …
Siderite, iron carbonate (FeCO3), a widespread mineral that is an ore of iron. The mineral commonly occurs in thin beds with shales, clay, or coal seams (as sedimentary deposits) and in hydrothermal metallic veins (as gangue, or waste rock). Manganese (Mn), magnesium (Mg), and calcium generally
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Calcite marble | mineral | Britannica
Other articles where calcite marble is discussed: calcite: Origin and occurrence: The resulting rocks are calcite marbles. Some calcite marbles, however, appear to have had dolostone …
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Mohs hardness | Definition, Table, Examples, & Facts | Britannica
The minerals contained in the scale are shown in the Table; also shown are other materials that approximate the hardness of some of the minerals. As is indicated by the ranking in the scale, if a mineral is scratched by orthoclase but not by apatite, its Mohs hardness is between 5 and 6. In the determination procedure it is necessary to be ...
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Geode | Crystals, Formation & Structure | Britannica
Ask the Chatbot a Question Ask the Chatbot a Question geode, hollow mineral body found in limestones and some shales. The common form is a slightly flattened globe ranging in diameter from 2.5 to more than 30 cm (1 to 12 inches) and containing a chalcedony layer surrounding an inner lining of crystals. The hollow interior often is nearly filled with inward-projecting crystals, …
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sulfide mineral summary | Britannica
sulfide mineral, or sulphide mineral, Any member of a group of compounds of sulfur with one or more metals. The metals that occur most commonly are iron, copper, nickel, lead, cobalt, silver, and zinc. They are the ore minerals of most metals used by industry (e.g., antimony, bismuth, copper, lead, nickel, and zinc).
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Mineral
Mineral - Halides, Crystals, Properties: Members of this class are distinguished by the large-sized anions of the halogens chlorine, bromine, iodine, and fluorine. The ions carry an electric charge of negative one and easily become distorted in the presence of strongly charged bodies. When associated with rather large, weakly polarizing cations of low charge, …
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Garnet
Garnet - Mineral, Crystals, Rocks: The rock-forming garnets are most common in metamorphic rocks. A few occur in igneous rocks, especially granites and granitic pegmatites. Garnets derived from such rocks occur sporadically in clastic sediments and sedimentary rocks. Typical occurrences of the common rock-forming garnets are given in the Table. Garnets …
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Mineral
Mineral - Silicates, Crystalline, Structure: The silicates, owing to their abundance on Earth, constitute the most important mineral class. Approximately 25 percent of all known minerals and 40 percent of the most common ones are silicates; the igneous rocks that make up more than 90 percent of Earth's crust are composed of virtually all silicates. The fundamental …
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Clintonite | Silicate Mineral, Magnesium Iron & Calcium …
Clintonite, mica mineral, a basic aluminosilicate of calcium, magnesium, and iron. It occurs in chlorite schist (with talc) and in altered limestones. Clintonite is the primary member of a group of micas (also including margarite) in which calcium substitutes for potassium and the silicon content ... Encyclopaedia Britannica's editors oversee ...
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Aragonite | Carbonate, Calcium, Crystals | Britannica
aragonite, widespread mineral, the stable form of calcium carbonate (CaCO 3) at high pressures.It may be distinguished from calcite, the commoner form of calcium carbonate, by its greater hardness and specific gravity.Aragonite is always found in deposits formed at low temperatures near the surface of the Earth, as in caves as stalactites, in the oxidized zone of …
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Cave
Cave - Solution, Erosion, Formations: As previously noted, the largest and most common caves are those formed by dissolution of limestone or dolomite. Limestone is composed mostly of calcium carbonate in the form of the mineral calcite. Dolomite rock consists of calcium magnesium carbonate, the mineral dolomite. Both these carbonate minerals are somewhat …
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Calcite group | mineralogy | Britannica
Other articles where calcite group is discussed: mineral: Carbonates: …that differ in structure type: calcite, aragonite, and dolomite. The copper carbonates azurite and malachite are the only notable hydrous varieties.
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Silicate mineral | Definition & Types | Britannica
Silicate mineral, any of a group of silicon-oxygen compounds that are widely distributed throughout much of the solar system. The silicates make up about 95 percent of Earth's crust and upper mantle, occurring as the major constituents of most igneous rocks. ... Encyclopaedia Britannica's editors oversee subject areas in which they have ...
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Limestone | Characteristics, Formation, Texture, Uses, & Facts | Britannica
Limestone, sedimentary rock composed mainly of calcium carbonate, usually in the form of calcite or aragonite. It may contain considerable amounts of magnesium carbonate (dolomite) as well; minor constituents also commonly present include clay, iron carbonate, feldspar, pyrite, and quartz.
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Marble | Definition, Types, Uses, & Facts | Britannica
Articles from Britannica Encyclopedias for elementary and high school students. marble - Student Encyclopedia (Ages 11 and up) ... such as that from Carrara, contain some accessory minerals, which, in many cases, form a considerable proportion of the mass. ... producing fissures that are afterward filled with veins of calcite; in this way the ...
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calcite summary | Britannica
calcite, Most common form of natural calcium carbonate (CaCO 3 ), a widely distributed mineral known for the beautiful development and great variety of its crystals. It occurs in stalagmites …
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clay mineral
Ask the Chatbot a Question Ask the Chatbot a Question clay mineral, any of a group of important hydrous aluminum silicates with a layer (sheetlike) structure and very small particle size. They may contain significant amounts of iron, alkali metals, or alkaline earths.. General considerations. The term clay is generally applied to (1) a natural material with plastic properties, (2) particles …
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Strontianite | Sulfate Mineral, Carbonate Mineral, Calcium Mineral …
strontianite, a strontium carbonate mineral (SrCO 3) that is the original and principal source of strontium.It occurs in white masses of radiating fibres, although pale green, yellow, or gray colours are also known. Strontianite forms soft, brittle crystals that are commonly associated with barite, celestine, and calcite in low-temperature veins. . Notable deposits exist in North Rhine ...
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Stalagmite | mineral formation | Britannica
Other articles where stalagmite is discussed: stalactite and stalagmite: stalagmite, elongated forms of various minerals deposited from solution by slowly dripping water. A stalactite hangs like an icicle from the ceiling or sides of a cavern. A stalagmite appears like an inverted stalactite, rising from the floor of a cavern.
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1911 Encyclopædia Britannica/Calcite
1911 Encyclopædia Britannica/Calcite. From Wikisource ... CALCITE, a mineral consisting of naturally occurring calcium carbonate, CaCO 3, crystallizing in the rhombohedral system. With the exception of quartz, it is the most widely distributed of minerals, whilst in the beautiful development and extraordinary variety of form of its crystals it ...
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Calcite : Properties, Formation, Occurrence and …
Calcite is a mineral that holds a significant place in the world of geology, mineralogy, and various industries due to its distinctive properties and widespread occurrence. It is a calcium carbonate mineral with the chemical …
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Helictite | Stalactite Formation, Cave Minerals & Speleothems | Britannica
helictite, cave deposit that has a branching, curved, or spiralled shape and may grow in any direction in seeming defiance of gravity. A helictite begins as a soda-straw-like tube formed as individual drops of water deposit calcium carbonate around the rim. The drops do not fall as in stalactite formation but evaporate in place. The direction of growth is thought to be determined …
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Calcium | Definition, Properties, & Compounds
Articles from Britannica Encyclopedias for elementary and high school students. calcium - Children's Encyclopedia (Ages 8-11) ... calcite Calcite, the most common form of natural calcium carbonate (CaCO 3). It is …
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Calcite
Physical Properties of Calcite. Pure calcite is transparent and colorless but also occurs in white, gray, yellow, orange, red, brown, black, or rarely, also blue. Calcite defines the hardness 3 on Moh's scale with specific …
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