Rhodochrosite
Rhodochrosite (Manganese Carbonate) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal; massive and rhombohedral crystals occur, but common as stalactitic or banded aggregate
Mineral Group
Carbonate (Calcite group)
Chemical Formula
MnCO3 (often with iron, magnesium, or calcium)
Formation Process
Hydrothermal (low-temperature veins associated with silver, copper, and lead deposits) or secondary oxidation
About This Crystal
Exhibits distinct pink to reddish-pink hues with white to cream-colored concentric bands; typically polished into a spherical or cabochon shape. Opaque to translucent with a vitreous to pearly luster.
Physical Characteristics
Pink body color, white streak, perfect rhombohedral cleavage (not visible in polished sphere), uneven fracture, 3.5 to 3.7 specific gravity. Can show weak red fluorescence.
Optical Properties
Uniaxial negative; Refractive Index of 1.597 to 1.816. Extremely high birefringence. Opaque specimens show no transparency-related effects.
Hardness & Durability
Origin Region
Argentina (notable for banded stalactitic forms), Colorado (USA), Peru, South Africa, and Russia
Hardness & Durability
Mohs hardness 3.5 to 4.0; very brittle and soft, sensitive to acids and heat. Not recommended for rings without protection.
Care & Maintenance
Clean only with mild warm soapy water; avoid ultrasonics, steam, and acidic cleaners. Store separately from harder stones like quartz to prevent scratches.
Rarity & Value
Relatively uncommon; high-quality deep red transparent crystals are very rare. Banded Argentine material is valued for its unique 'bacon' appearance.
Special Characteristics
Distinctive zig-zag or concentric banding patterns; some specimens exhibit strong pink fluorescence under long-wave UV light.
Lore & History
Historically known as 'Rosa del Inca' (Inca Rose) in Argentina; traditionally associated with the heart chakra, emotional healing, and compassionate love.