Rhodonite
Rhodonite (Manganese Silicate) · Semi-Precious Gemstone / Mineral Specimen / Decorative Stone
Crystal System
Triclinic; typically found in massive, granular, or rounded forms like tumbled stones.
Mineral Group
Silicates; Inosilicate subgroup (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, rose-pink to brownish-red stone characterized by distinctive black dendritic inclusions of manganese oxide. It features a vitreous to pearly luster and is often polished into spheres or tumbled shapes.
Physical Characteristics
Color: Pink to red with black veins; Streak: White; Cleavage: Perfect in two directions (rarely seen in massive form); Fracture: Conchoidal to uneven; Specific Gravity: 3.5–3.7; Non-fluorescent.
Optical Properties
Refractive Index: 1.716–1.752; Birefringence: 0.010–0.015; Doubly refractive; No significant pleochroism in massive form.
Hardness & Durability
Origin Region
Prominent sources include Russia (Ural Mountains), Australia (Broken Hill), Brazil, Peru, and the USA (New Jersey).
Hardness & Durability
Mohs hardness: 5.5 to 6.5; Brittle tenacity; Fair durability but sensitive to hard knocks due to cleavage planes.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, steam, and harsh chemicals. Store separately to prevent scratches from harder stones like quartz.
Rarity & Value
Common; Value is driven by the intensity of the pink color and the aesthetic pattern of the black manganese veins. Generally affordable.
Special Characteristics
Known for its 'dendritic' black manganese oxide patterns which often resemble moss or landscape scenes against the pink background.
Lore & History
Historically used in Russia as a decorative stone for sarcophagi and palace tiles. Traditionally associated with the Heart Chakra and believed to aid in emotional balancing and healing past traumas.