metamorphic
Polished/tumbled rhodonite-rich stone
Rhodonite (MnSiO₃), likely mixed with quartz and manganese oxides
AI-generated identification · may be incorrectPink to salmon-red matrix with dark gray-green veining; vitreous to pearly luster, triclinic crystal structure, imperfect cleavage, Mohs hardness about 5.5–6.5, and specific gravity near 3.4–3.7. The rounded surface indicates tumbling or natural abrasion.
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Physical properties
Pink to salmon-red matrix with dark gray-green veining; vitreous to pearly luster, triclinic crystal structure, imperfect cleavage, Mohs hardness about 5.5–6.5, and specific gravity near 3.4–3.7. The rounded surface indicates tumbling or natural abrasion.
Formation & geological history
Rhodonite forms mainly in manganese-rich metamorphic deposits through hydrothermal or regional metamorphic processes, commonly in Precambrian rocks. Associated quartz and manganese oxides create the contrasting veining and dark patches.
Uses & applications
Used as an ornamental stone, lapidary material, cabochons, carvings, and collectible specimens; it has limited industrial use. Fine, strongly colored material is used in jewelry.
Geological facts
Rhodonite’s color is caused by manganese, while black dendritic or massive areas may be manganese oxides such as pyrolusite. It can be confused with rhodochrosite, which is generally softer and more distinctly banded.
Field identification & locations
Common localities include the Ural Mountains, Peru, Australia, Brazil, Madagascar, and the western United States. Confirm with a hardness test and streak; strong acid reaction would suggest carbonate minerals rather than rhodonite.
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