a SEM image of chalk made up of calcium carbonate. b SEM image of chalk... | Download Scientific Diagram
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Close up of piece of white chalk on black slate. Blackboard chalk manufacturers now may use mineral chalk, other mineral sources of calcium carbonate, or the mineral gypsum (calcium sulfate). 素材庫相片
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Gypsum isolated on black. Sulfate mineral composed of calcium sulphate, used as plaster and blackboard chalk Stock Photo - Alamy
Solved 5. Chalk contains both calcium carbonate and calcium | Chegg.com