Calcite CaCO3 HSN : 25309030
The most common form of natural calcium carbonate. Dogtooth spar, Ice- land spar, nailhead spar, and satin spar are vari- eties of calcite. Essential ingredient of limestone, marble, and chalk.
Properties: Colorless, white, and various colored crystals, vitreous to earthy luster, good cleavage in three directions. May contain small amounts of magnesium, iron, manganese, and zinc. Reacts with acids to evolve carbon dioxide. D 2.72, Mohs hardness 2.
Use: Phosphor. Iceland spar is used in optical in- struments.
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