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Chalk is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite which is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It forms under relatively deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms. Chalk can also refer to other compounds including magnesium silicate and calcium sulfate.
Wiki User
∙ 14y ago
Wiki User
∙ 8y agoChalk is a form of calcium carbonate, having the same chemical composition as ground calcium carbonate, limestone, marble, and precipitated calcium carbonate(PCC). In fact, all of the calcium carbonates listed in the previous sentence have the same crystal form, calcite.
Wiki User
∙ 14y agoWiki User
∙ 13y agoChalk the rock:- Calcium Carbonate - Calcium, Oxygen and Carbon (CaCO3).
Blackboard Chalk:- calcium sulfate dihydrate - Calcium, Oxygen, Hydrogen and Sulfur (CaSO4·2H2O)
Wiki User
∙ 13y agoChalk is calcium carbonate (CaCO3) with some inherent impurities as silt or clay.
Wiki User
∙ 15y agocalcium hidoxide
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