metamorphic
Polished Rhodonite Obelisk
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3
Hardness: 5.5-6.5 on Mohs scale; Color: Pink, rose-red to brownish-red with veins of black manganese oxide; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect; 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, rose-red to brownish-red with veins of black manganese oxide; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect; Specific gravity: 3.5–3.7
Formation & geological history
Commonly forms in manganese-rich hydrothermal veins or contact metamorphic deposits where manganese-rich sediments are altered by heat and pressure.
Uses & applications
Primarily used as an ornamental stone, for lapidary work, jewelry (cabochons and beads), and as a minor ore of manganese.
Geological facts
The name comes from the Greek word 'rhodos', meaning rosy. It was once used in Russia to create massive architectural decorative pieces, including the sarcophagus of Empress Maria Alexandrovna.
Field identification & locations
Identify in the field by its distinct pink color often associated with black dendritic or veiny inclusions of manganese oxides. Found in Russia (Urals), Australia, Brazil, and the USA (New Jersey).
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