metamorphic
Polished rhodonite
Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides
AI-generated identification · may be incorrectTypically rose-pink to red with black dendritic or massive manganese-oxide veining; vitreous to pearly luster, triclinic crystal structure, perfect cleavage in two directions, Mohs hardness 5.5–6.5, and specific gravity about 3.4–3.7. This specimen is highly polished and shaped as a freeform display stone.
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Physical properties
Typically rose-pink to red with black dendritic or massive manganese-oxide veining; vitreous to pearly luster, triclinic crystal structure, perfect cleavage in two directions, Mohs hardness 5.5–6.5, and specific gravity about 3.4–3.7. This specimen is highly polished and shaped as a freeform display stone.
Formation & geological history
Forms mainly in manganese-rich metamorphic deposits, commonly through hydrothermal alteration or contact metamorphism; associated rocks may be Precambrian to younger, depending on the locality. The black material is usually pyrolusite or other manganese oxides.
Uses & applications
Used as an ornamental stone, cabochon, carving, jewelry, and polished décor; rarely used industrially because manganese ores are more practical sources of manganese.
Geological facts
Its vivid pink color is diagnostic, though weathering can darken it to brown or gray. Major sources include Russia’s Ural Mountains, Australia, Peru, Madagascar, South Africa, and the United States.
Field identification & locations
Identify it by the distinctive pink body color, black oxide veining, relatively high density, and hardness below quartz; avoid confusing it with pink marble or dyed stone. A polished piece of this size commonly sells for about $40–$200, with exceptional material priced higher.
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