Rhodochrosite
Carbonate var. Rhodochrosite · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Trigonal system; typically found in massive, granular, or botryoidal forms; rarely as rhombohedral crystals.
Mineral Group
Carbonates; Calcite group member
Chemical Formula
MnCO3 (Manganese Carbonate) with possible Fe, Mg, Ca substitutions
Formation Process
Hydrothermal; forms in low to medium temperature hydrothermal veins as a secondary mineral in manganese-rich environments.
About This Crystal
Exhibits a characteristic pink to rose-red color. The specimen appears massive with white to light grey matrix or banding. It has a vitreous to pearly luster and is translucent to opaque.
Physical Characteristics
Color: Pink to red (streak is white); Cleavage: Perfect rhombohedral in 3 directions; Fracture: Uneven to conchoidal; Specific Gravity: 3.5–3.7; Fluorescence: Often none, but may show weak red under UV.
Optical Properties
Refractive Index: 1.597–1.816; Birefringence: Strong (0.219); Uniaxial negative; Pleochroism: Strong pinkish-red to pale pink.
Hardness & Durability
Origin Region
Argentina (Capillitas mine), South Africa, Peru, USA (Colorado/Sweet Home Mine), and Romania.
Hardness & Durability
Mohs hardness: 3.5 to 4.0; Poor durability; brittle and soft, highly susceptible to scratches and acid.
Care & Maintenance
Avoid chemicals, acids (vinegar/lemon), and ultrasonic cleaners. Clean only with warm soapy water and a soft cloth. Store separately from harder gemstones to prevent scratching.
Rarity & Value
Relatively rare in high-quality crystal form. Value depends on color saturation (vivid red is best) and banding patterns. Common treatments include resin impregnation to improve stability.
Special Characteristics
Distinctive zig-zag or concentric 'bacon strip' banding in stalactites; rarely forms transparent deep red gems of high value.
Lore & History
Historically known as 'Rosa del Inca' by the Incas, believed to be the solidified blood of ancestral rulers. In modern practices, it is associated with the heart chakra and emotional healing.