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| Occurrence and Production of Calcium |
 Occurrence
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| Calcium is not naturally found in its elemental state. Calcium occurs most commonly in sedimentary rocks in the minerals calcite, dolomite (CaMg(CO3)2) and gypsum (CaSO4.2H2O). It occurs in igneous and metamorphic rocks chiefly in the silicate minerals: plagioclase, amphiboles, pyroxenes and garnets. |