metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Hardness: 5.5-6.5 on the Mohs scale. Color: Rose-pink to brownish-red with distinct black inclusions of manganese oxide. 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 the Mohs scale. Color: Rose-pink to brownish-red with distinct black inclusions of manganese oxide. Luster: Vitreous to pearly. Crystal Structure: Triclinic. Cleavage: Perfect in two directions. Specific Gravity: 3.5-3.7.
Formation & geological history
Formed in manganese-rich hydrothermal veins, metamorphic rocks, and contact metamorphic zones. Most significant deposits are from the Precambrian or Palaeozoic eras, found primarily in areas of high-grade regional metamorphism.
Uses & applications
Commonly used as an ornamental gemstone for jewelry (cabochons, beads), small carvings, and decorative tiles. Historically used as a minor ore of manganese.
Geological facts
The name is derived from the Greek word 'rhodon', meaning rose. It is the official state gemstone of Massachusetts, USA. It is famous for its 'black dendritic' patterns formed by manganese oxide, which provide a stark contrast to the pink base.
Field identification & locations
Identify by its characteristic pink color paired with black veins; unlike Rhodochrosite, Rhodonite is harder and lacks white banding. Found in remote locations like the Ural Mountains (Russia), Australia, Brazil, and British Columbia. Often found alongside other manganese minerals like Braunite or Spessartine.
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