rhodochrosite

A trigonal mineral, MnCO₃ ; calcite group, with Mn replaced by Fe toward siderite, Ca toward calcite, Mg, Zn, Co, and Cd; rhombohedral cleavage; in hydrothermal veins, residual manganese deposits, and pegmatites; a minor source of manganese. Syn: manganese spar See also: dialogite; raspberry spar.
Source: Dictionary of Mining, Mineral, and Related Terms

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