Rhodochrosite
Manganese Carbonate var. Rhodochrosite · Semi-Precious Gemstone / Collector Mineral
Crystal System
Trigonal. In this specimen it appears as a massive, banded, or stalactitic habit with wavy, concentric layers.
Mineral Group
Carbonate Mineral Group (Calcite Group); Anhydrous Carbonate.
Chemical Formula
MnCO3 (Manganese Carbonate); frequently contains Calcium (Ca), Magnesium (Mg), and Iron (Fe) substitutions.
Formation Process
Primarily Hydrothermal; forms as a secondary mineral in manganese-rich hydrothermal veins and in the oxidation zones of manganese ore deposits.
About This Crystal
A translucent to opaque specimen with characteristic 'bacon-strip' banding. It features wavy layers of pale pink, creamy white, and deep raspberry red. Luster is vitreous to pearly.
Physical Characteristics
Color: Pink to deep red with white banding. Streak: White. Cleavage: Perfect rhombohedral in crystal form, though not visible in this banded cabochon. Specific Gravity: 3.5–3.7. Fluoresces pink under longwave UV light.
Optical Properties
Uniaxial negative; Refractive Index: 1.597–1.816. Strong birefringence. Opaque to translucent layers show no significant pleochroism in this massive form.
Hardness & Durability
Origin Region
Notable sources include Argentina (Capillitas mine), Peru, South Africa, and Colorado, USA (Sweet Home Mine).
Hardness & Durability
Mohs Hardness: 3.5 to 4.0. It is a soft stone, quite fragile (brittle), and susceptible to scratching and chemical erosion.
Care & Maintenance
Extremely sensitive! Avoid ultrasonic cleaners, steam, and acids (even vinegar). Clean only with warm soapy water and a soft cloth. Store separately to prevent scratches from harder gems like quartz.
Rarity & Value
Moderately rare. High-quality banded material from Argentina is valued for its patterns. Value is based on color intensity, pattern definition, and lack of yellowish/brownish oxidation.
Special Characteristics
Displays distinct concentric, scalloped, or 'stalactitic' banding patterns created by the rhythmic precipitation of manganese carbonate.
Lore & History
Historically known as 'Inca Rose' (Rosa del Inca) by the Incas, who believed it was the solidified blood of their ancestors. In modern lore, it is associated with the Heart Chakra and emotional healing.