chalk, A soft white rock used for writing on blackboards; made of calcium sulfate., gypsum, A soft mineral made of calcium sulfate; used in plaster., calcium sulfate, A chemical compound, often found in gypsum and chalk., limestone, A rock made mostly of calcium carbonate; used in construction., calcite, A mineral form of calcium carbonate; forms crystals., calcium carbonate, A chemical compound found in limestone, marble, and shells., crystal, A solid material with a regular, repeating pattern of atoms., ore, A rock that contains enough metal to be mined for profit., alkaline, A substance that is opposite of acidic. (Calcium), calcium hydroxide, A chemical compound (slaked lime), used in paper making..
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Calcium
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