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  2. Calcite - Wikipedia

    en.wikipedia.org/wiki/Calcite

    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 ...

  3. Limestone - Wikipedia

    en.wikipedia.org/wiki/Limestone

    Limestone often contains larger crystals of calcite, ranging in size from 0.02 to 0.1 mm (0.79 to 3.94 mils), that are described as sparry calcite or sparite. Sparite is distinguished from micrite by a grain size of over 20 μm (0.79 mils) and because sparite stands out under a hand lens or in thin section as white or transparent crystals.

  4. Marble - Wikipedia

    en.wikipedia.org/wiki/Marble

    Construction marble is a stone which is composed of calcite, dolomite or serpentine that is capable of taking a polish. [20] More generally in construction , specifically the dimension stone trade, the term marble is used for any crystalline calcitic rock (and some non-calcitic rocks) useful as building stone.

  5. Calcium carbonate - Wikipedia

    en.wikipedia.org/wiki/Calcium_carbonate

    Crystal structure of calcite. Calcium carbonate is a chemical compound with the chemical formula Ca CO 3.It is a common substance found in rocks as the minerals calcite and aragonite, most notably in chalk and limestone, eggshells, gastropod shells, shellfish skeletons and pearls.

  6. Carbonate rock - Wikipedia

    en.wikipedia.org/wiki/Carbonate_rock

    Limestone is the most common carbonate rock [3] and is a sedimentary rock made of calcium carbonate with two main polymorphs: calcite and aragonite.While the chemical composition of these two minerals is the same, their physical properties differ significantly due to their different crystalline form.

  7. Iceland spar - Wikipedia

    en.wikipedia.org/wiki/Iceland_spar

    Studying Iceland spar can provide valuable information about past environmental conditions, such as the presence of ancient seas and marine life, as carbonate rocks like limestone often form in marine environments. [58] The presence of Iceland spar can also indicate the presence of hydrothermal activity, as calcite can form in hydrothermal ...

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