Rhodonite
Rhodonite (IMA approved mineral species) · Semi-Precious Gemstone / Mineral Specimen / Decorative Stone
Crystal System
Triclinic; typically found in massive or granular habits, rarely as tabular or blade-like crystals.
Mineral Group
Silicates; specifically a Inosilicate (Chain Silicate) belonging to the Pyroxenoid group.
Chemical Formula
(Mn2+,Fe2+,Mg,Ca)SiO3
Formation Process
Metamorphic or Hydrothermal; typically forms during regional metamorphism of manganese-rich sediments or within hydrothermal replacement deposits.
About This Crystal
This specimen is a polished palm stone or cabochon showing a characteristic 'bubblegum' pink base color with significant inclusions. It features bands of greyish-brown and yellow-ochre matrix, along with fine black dendritic or veiny inclusions of manganese oxides. The luster is vitreous to waxy, and the specimen is opaque.
Physical Characteristics
Color: Pink to rose-red with black/brown/yellow inclusions; Streak: White; Cleavage: Perfect in two directions (not visible in polished form); Fracture: Uneven to conchoidal; Specific Gravity: 3.5–3.7; Tenacity: Brittle; Fluorescence: Generally non-fluorescent.
Optical Properties
Refractive Index: 1.716–1.752; Birefringence: 0.010–0.015; Pleochroism: Weak (red, orange, yellow-red); Optical Nature: Biaxial positive; Transparency: Opaque to translucent in thin sections.
Hardness & Durability
Origin Region
Notable sources include Russia (Urals), Australia (Broken Hill), Brazil, Peru, Madagascar, and the USA (New Jersey). It forms in manganese-rich metamorphic rocks and hydrothermal veins.
Hardness & Durability
Mohs Hardness: 5.5 to 6.5. It is moderately durable but susceptible to damage from harder stones like quartz. Toughness is generally good due to its compact massive structure.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners and steam cleaning. Store separately from harder gemstones to prevent scratching. Avoid prolonged exposure to harsh acids.
Rarity & Value
Common to Uncommon. Value is determined by the intensity of the pink color and the aesthetic balance of the black manganese patterns. High-grade translucent pink material is more valuable than opaque matrix-heavy specimens.
Special Characteristics
The most distinctive feature is the presence of dendritic black manganese oxide veins (psilomelane or pyrolusite) that provide a sharp contrast against the pink silicate groundmass.
Lore & History
Historically used in Russia as a decorative stone for sarcophagi and palace interiors. In traditional lore, it is known as the 'Stone of Compassion,' associated with the Heart Chakra and believed to help clear emotional wounds and foster forgiveness.