Rhodochrosite
Rhodochrosite (Manganese Carbonate) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Trigonal; usually occurs in massive, stalactitic, botryoidal, or granular habits with banded patterns.
Mineral Group
Carbonates; Calcite group
Chemical Formula
MnCO3 (often with Ca, Mg, Fe substitutions)
Formation Process
Primarily hydrothermal in origin, forming in veins with other manganese minerals; also occurs as a secondary mineral in manganese deposits.
About This Crystal
Pink to deep red body color characterized by distinct 'bacon-strip' or concentric zigzag banding of white to light pink. It is translucent to opaque with a vitreous to pearly luster.
Physical Characteristics
Pink color with white streak. Features perfect rhombohedral cleavage, uneven to conchoidal fracture, and a specific gravity of 3.5–3.7. Often fluoresces pink under UV light.
Optical Properties
Refractive index of 1.597–1.816; high birefringence (0.219). Strongly doubly refractive. No significant dispersion or pleochroism in banded varieties.
Hardness & Durability
Origin Region
Argentina (Capillitas Mine), Peru, South Africa, and Colorado, USA (Sweet Home Mine).
Hardness & Durability
Mohs hardness 3.5–4.0. It is quite soft and brittle with perfect cleavage, making it susceptible to scratches and fractures in jewelry.
Care & Maintenance
Avoid ultrasonic/steam cleaners. Clean with warm soapy water only. Sensitive to acids/household chemicals. Store separately to prevent scratching.
Rarity & Value
Uncommon. Value is driven by color saturation and pattern. High-quality banded material from Argentina is highly sought after; gem-quality crystals are very rare.
Special Characteristics
Distinctive concentric banding (stalactitic growth) and 'Inca Rose' patterns; strong reaction to warm hydrochloric acid (effervescence).
Lore & History
Known as 'Inca Rose' as the Incas believed it was the solidified blood of their ancestral rulers. Metaphysically associated with self-love, emotional healing, and the heart chakra.