Rock Identifier
Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral
mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

AI-generated identification · may be incorrect

Hardness: 3.5-4 on the Mohs scale. Color: Soft pink to rose-red, often with white banding or inclusions. Luster: Vitreous to pearly. Crystal Structure: Trigonal. Cleavage: Perfect rhombohedral in 3 directions. Specific Gravity: 3.5-3.7.

Hardness
3
Luster
Vitreous to pearly
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Physical properties

Hardness: 3.5-4 on the Mohs scale. Color: Soft pink to rose-red, often with white banding or inclusions. Luster: Vitreous to pearly. Crystal Structure: Trigonal. Cleavage: Perfect rhombohedral in 3 directions. Specific Gravity: 3.5-3.7.

Formation & geological history

Forms primarily as a secondary mineral in hydrothermal veins associated with silver, copper, and lead deposits, or as a secondary mineral in sedimentary manganese deposits.

Uses & applications

Popular as an ornamental stone, lapidary material, gemstone, and mineral specimen for collectors. Minor ore of manganese.

Geological facts

Rhodochrosite is the official state mineral of Colorado, home to the famous Sweet Home Mine near Alma, which produced world-class cherry-red rhodochrosite crystals.

Field identification & locations

Recognized by its distinct rose-pink hue, softness, and effervescence when exposed to warm, dilute hydrochloric acid. Commonly found in Argentina, Peru, Colorado (USA), South Africa, and Russia.

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