Rhodonite
Rhodonite (Manganese Silicate) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Triclinic; typically found in massive, granular, or rounded forms like this polished sphere.
Mineral Group
Silicates (Inosilicates)
Chemical Formula
(Mn,Fe,Mg,Ca)SiO3
Formation Process
Forms via regional or contact metamorphism of manganese-rich rocks, or through hydrothermal processes.
About This Crystal
A polished dark pink to brownish-red sphere with characteristic black dendritic or patchy inclusions. It is opaque with a waxy to vitreous luster.
Physical Characteristics
Color: Pink to brownish-red with black manganese oxide inclusions; Streak: White; SG: 3.5-3.7; Fracture: Uneven to conchoidal.
Optical Properties
Opaque; Refractive Index: 1.716-1.752; Biaxial positive; Does not show prominent optical phenomena in this form.
Hardness & Durability
Origin Region
Found in Australia, Finland, Japan, Canada, and notably the Ural Mountains of Russia and Minas Gerais, Brazil.
Hardness & Durability
Mohs Hardness: 5.5-6.5; Brittle tenacity; Good for decorative use but can be scratched by harder stones.
Care & Maintenance
Clean with warm soapy water only; avoid ultrasonic cleaners and harsh chemicals due to potential porosity and metallic inclusions.
Rarity & Value
Common; Value is driven by the saturation of the pink color and the pattern of black manganese inclusions. Relatively affordable.
Special Characteristics
Characteristic black manganese oxide (like pyrolusite) veins or spots that create contrast against the pink base.
Lore & History
Historically used in Russia for decorative architecture and jewelry. Traditionally associated with emotional healing and the heart chakra.