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Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO 3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are used in optical equipment, and limestone composed ...
As a type of calcite, Iceland spar can be used in construction as a building material in cement and concrete. Its high purity and brightness make it an ideal filler in paints and coatings. [ 54 ] In metallurgy, calcite acts as a flux to lower the melting point of metals during smelting and refining. [ 55 ]
The Altamura Man is a fossil of the genus Homo discovered in 1993 in a karst sinkhole in the Lamalunga Cave near the city of Altamura, Italy.Remarkably well preserved but covered in a thick layer of calcite taking the shape of cave popcorn the find was left in situ in order to avoid damage.
It is most likely that calthemite flowstone is precipitated from leachate solution as calcite, "in preference to the other, less stable polymorphs, aragonite and vaterite." [8] Other trace elements such as iron from rusting reinforcing or copper oxide from pipework may be transported by the leachate and deposited at the same time as the CaCO 3. [8]
Cave pearls form when water dripping into a cave loses carbon dioxide and precipitates calcite. A cave pearl forms when the water is moving too vigorously to form a stalagmite . A nucleus of matter (such as a grain of sand ) becomes coated with calcite , and the current then provides a rotation to the nucleus in such a way that it is coated evenly.
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Dogtooth spar with fluorite from the Elmwood Mine in Tennessee. Spar is an old mining or mineralogy term used to refer to crystals that have readily discernible faces. A spar will easily break or cleave into rhomboidal, cubical, or laminated fragments with smooth shiny surfaces.
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