Rhodonite
Rhodonite (Manganese Silicate) · Semi-Precious Gemstone / Ornamental Stone
Crystal System
Triclinic; typically found in massive, granular, or compact habits rather than distinct crystals.
Mineral Group
Silicates; Chain silicate (Inosilicate) / Pyroxenoid group
Chemical Formula
(Mn,Fe,Mg,Ca)SiO3
Formation Process
Metamorphic or Hydrothermal; typically forms in manganese-rich metamorphic rocks or through hydrothermal replacement in ore deposits.
About This Crystal
An opaque pink to rose-red stone characterized by distinctive black dendritic inclusions or veins of manganese oxide. It features a vitreous to pearly luster and a smooth, waxy surface when polished.
Physical Characteristics
Color: Pink to brownish-red with black veins. Streak: White. Cleavage: Perfect in two directions. Fracture: Conchoidal to uneven. Specific Gravity: 3.5–3.7. Luminescence: Generally none, occasionally weak red.
Optical Properties
Refractive Index: 1.716–1.752. Birefringence: 0.010–0.015. Biaxial positive. Generally opaque to translucent in thin sections.
Hardness & Durability
Origin Region
Russia (Ural Mountains), Australia (Broken Hill), Brazil, Peru, Madagascar, and USA (New Jersey).
Hardness & Durability
Mohs Hardness: 5.5 to 6.5. Toughness: Brittle to fair. Suitable for cabochons and carvings but requires care in rings.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners, steam cleaning, and harsh chemicals (acids). Store separately to prevent scratching from harder stones like quartz.
Rarity & Value
Common globally but high-quality gem-grade specimens with deep saturation and minimal black veining are rarer and more valuable.
Special Characteristics
Distinctive black 'matrix' patterns caused by manganese oxidation. Occasionally exhibits chatoyancy in rare fibrous specimens.
Lore & History
Historically used in Russia as a protective stone and for decorative architecture (notably in the Kremlin). In metaphysical lore, it is known as the 'Stone of Compassion,' associated with the heart chakra and emotional healing.