smithsonite

smithsonite
/smith"seuh nuyt'/, n. Mineral.
a native carbonate of zinc, ZnCO3, that is an important ore of the metal.
[1825-35; named after J. SMITHSON (who distinguished it from calamine); see -ITE1]

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formerly  called Calamine,  
 zinc carbonate (ZnCO3), a mineral that was the principal source of zinc until the 1880s, when it was replaced by sphalerite. It is ordinarily found in the oxidized zone of ore deposits as a secondary mineral or alteration product of primary zinc minerals; notable deposits are at Laurium, Greece; Bytom and Tarnowskie Góry, Pol.; Sardinia, Italy; and Leadville, Colo., U.S. For detailed physical properties, see carbonate mineral (table).

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