chalk, A soft white rock for writing., Gypsum, A soft mineral used for plaster., Calcium Sulfate, The chemical used to make gypsum., Limestone, A rock made from sea creatures., Calcite, A clear mineral found in limestone., Calcium Carbonate, The hard material in rocks and shells., Crystal, A solid with perfect shapes., Ore, A rock with metal inside., Alkaline, The opposite of acidic., Calcium Hydroxide, A strong alkaline chemical used in cement..

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