Rhodonite
Rhodonite (Manganese Silicate) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Triclinic; typically found in massive, granular, or compact habits rather than distinct crystals.
Mineral Group
Silicates (Inosilicates)
Chemical Formula
(Mn,Fe,Mg,Ca)SiO3
Formation Process
Metamorphic or hydrothermal; typically forms in manganese-rich metamorphic rocks or through hydrothermal alteration in ore deposits.
About This Crystal
An opaque to translucent stone with a primary rose-pink to deep red body color. This specimen is polished into a heart shape, exhibiting a vitreous luster and characteristic brownish-black dendritic patterns or patches caused by manganese oxide oxidation.
Physical Characteristics
Color: Pink to brownish-red; Streak: White; Cleavage: Perfect in two directions (rarely seen in massive form); Fracture: Conchoidal to uneven; Specific Gravity: 3.5-3.7; Non-magnetic; Generally non-fluorescent.
Optical Properties
Refractive Index: 1.716-1.752; Biaxial positive; Opaque to translucent nature limits visible fire or dispersion; No significant optical phenomena like asterism.
Hardness & Durability
Origin Region
Prominent sources include Russia (Urals), Australia, Brazil, Sweden, Peru, and USA (New Jersey).
Hardness & Durability
Mohs hardness: 5.5 to 6.5; Brittle tenacity. Fair durability but susceptible to scratches from harder materials like quartz.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners and steam cleaning. Store away from harder gemstones to prevent surface scratching.
Rarity & Value
Relatively common; value is determined by the richness of the pink color and the aesthetic balance of the black manganese inclusions. Higher transparency increases value.
Special Characteristics
Known for its distinct 'pink and black' appearance; occasionally exhibits a 'color-change' to darker browns when exposed to surface weathering/oxidation.
Lore & History
Historically used in Russia as a protective stone and for decorative architecture (slabs used in the Moscow Metro). Metaphysically associated with the heart chakra and emotional healing/balance.