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carbonate for the first time in the school classroom, where we use blackboard chalk. chalk has been used as a writing tool for over years and is a fine, microcrystalline material. as limestone, calcium carbonate is a biogenic rock, and is more compacted than chalk. as marble, calcium carbonate is a coarse-crystalline
calcium supplement, antacid, phosphate binder, or base material for medicinal tablets. it also is found on many grocery store shelves in products such as baking powder, toothpaste, dry-mix dessert mixes, dough, and wine. calcium carbonate is the active ingredient in agricultural lime, and is used in animal...
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