metamorphic
Rhodonite
Rhodonite ((Mn2+,Fe2+,Mg,Ca)SiO3)
Hardness: 5.5-6.5 on Mohs scale; Color: Pink to rose-red with characteristic black manganese oxide veins or spots; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 3.5-3.7
- Hardness
- 5
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 5.5-6.5 on Mohs scale; Color: Pink to rose-red with characteristic black manganese oxide veins or spots; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 3.5-3.7
Formation & geological history
Forms in metamorphic rocks subject to hydrothermal alteration and contact metamorphism of manganese-rich sediments. Typically found alongside manganese ores and other silicate minerals.
Uses & applications
Used primarily as an ornamental stone, lapidary material, beads, cabochons, carvings, and popular among gemstone collectors.
Geological facts
The name rhodonite comes from the Greek word 'rhodon' meaning 'rose'. It is the official state gem of Massachusetts, USA. Russian czars traditionally used rhodonite for carving ornate urns, sarcophagi, and jewelry.
Field identification & locations
Identified by its distinct bubblegum-pink to deep rose color contrasting with black dendritic inclusions of manganese oxides. Common localities include Russia (Ural Mountains), Australia, Madagascar, Brazil, Sweden, and the USA (Massachusetts, New Jersey).
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