mineral

Rhodochrosite

Rhodochrosite (MnCO3)

Hardness: 3.5-4 on Mohs scale; Color: Cherry-red to deep rose-pink; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 3.7

Hardness: 3
Color: Cherry-red to deep rose-pink
Luster: Vitreous to pearly

Identified July 26, 2026More mineral →

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Physical properties

Formation & geological history

Hydrothermal vein mineral formed in low-to-medium temperature conditions, often associated with silver, copper, and lead ore deposits, as well as manganese sedimentary deposits. Notable specimens come from the Sweet Home Mine in Alma, Colorado.

Uses & applications

Highly prized as a mineral display specimen, faceting gemstone for collectors, and historically as an ore of manganese.

Geological facts

The intense deep red rhombohedral crystals from the Sweet Home Mine in Colorado are among the most famous and valuable fine mineral specimens in the world. Rhodochrosite is also the official state mineral of Colorado.

Field identification & locations

Identified by its distinctive cherry-red to pink color, rhombohedral crystal habit, softness (can be scratched by a copper coin), and strong reaction (effervescence) with warm dilute hydrochloric acid. Highly sought after by fine mineral collectors worldwide.