mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
Hardness 3.5-4 on Mohs scale; pink, rose-red to reddish-brown in color; vitreous to pearly luster; trigonal crystal system; rhombohedral cleavage; specific gravity 3.5-3.7.
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Physical properties
Hardness 3.5-4 on Mohs scale; pink, rose-red to reddish-brown in color; vitreous to pearly luster; trigonal crystal system; rhombohedral cleavage; specific gravity 3.5-3.7.
Formation & geological history
Formed in hydrothermal veins associated with copper, lead, silver, and zinc deposits, as well as in sedimentary manganese deposits.
Uses & applications
Used primarily as an ore of manganese, popular gemstone for jewelry, and highly sought-after by mineral collectors.
Geological facts
Rhodochrosite is the official state mineral of Colorado. The finest specimens come from the Sweet Home Mine near Alma, Colorado.
Field identification & locations
Can be identified by its distinctive pink color, low hardness (easily scratched by steel), and effervescence in warm, dilute hydrochloric acid. Found in Argentina, USA, South Africa, Peru, and Romania.
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