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calcite |
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calcite) Calcite through a polarized microscope. Calcite is the main constituent of limestone and marble. Colourless, white, or light-coloured common rock-forming mineral, calcium carbonate, CaCO3. It is the main constituent of limestone and marble and forms many types of invertebrate shell. Calcite often forms stalactites and stalagmites in caves and is also found deposited in veins through many rocks because of the ease with which it is dissolved and transported by groundwater; oolite is a rock consisting of spheroidal calcite grains. It rates 3 on the Mohs scale of hardness. Large crystals up to 1 m/3 ft have been found in Oklahoma and Missouri, USA. Iceland spar is a transparent form of calcite used in the optical industry; as limestone it is used in the building industry. |
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Snowy River formed as loads of calcite from the hollowed cave entered the groundwater. Some crop managers have long thought that cotton fiber quality and lint yield are adversely affected by the higher magnesium content of dolomite lime (calcium magnesium carbonate) compared with calcite lime (calcium carbonate). Being a highly organized network of microscopic channels, the magnesium calcite shell of the sea urchin has a configuration similar to that of a photonic crystal. |
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calcite
