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The Bureau of Mines publishes reports for a variety of calcium-containing minerals and compounds because of their commercial significance and contribution to the quality of human life. Calcium fluoride is sold as fluorspar; calcium sulfate as gypsum or anhydrite; calcium oxide and hydroxide as lime; calcium phosphate as phosphate rock; and calcium carbonate as either limestone, marble, calcareous marl, or shell. Information on these commodities can be obtained in the Bureau of Mines Minerals Yearbooks reports entitled 'Fluorspar,' 'Gypsum,' 'Lime,' 'Phosphate Rock,' 'Crushed Stone,' and 'Dimension Stone.' Other calcium compounds are discussed in the Yearbook reports concerning the element with which calcium is combined; for example, calcium bromide is covered in the 'Bromine' report in the Minerals Yearbook. The 'Calcium and Calcium Compounds' Minerals Yearbook report includes calcium metal, calcium chloride, and various other calcium compounds not covered elsewhere.