mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
Hardness: 3.5-4 on Mohs scale; Color: Pink, rose-red to brownish; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 3.5-3.7
- Hardness
- 3
- Color
- Pink, rose-red to brownish
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: Pink, rose-red to brownish; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 3.5-3.7
Formation & geological history
Formed primarily in hydrothermal veins associated with copper, lead, and silver deposits, as well as in low-temperature metamorphic environments and sedimentary deposits.
Uses & applications
Popular gemstone used in jewelry, cabochons, and beads; highly prized mineral collector specimen; minor ore of manganese.
Geological facts
Rhodochrosite is the national gemstone of Argentina, where famous banded stalactitic deposits are mined. It is also the official state mineral of Colorado, USA.
Field identification & locations
Identified by its distinctive rose-pink color, low hardness (scratched by a copper coin or steel knife), and effervescence in warm diluted hydrochloric acid. Common locations include Argentina, Peru, Colorado (Sweet Home Mine), South Africa, and Russia.
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