metamorphic
Rhodonite-bearing metamorphic rock
Manganese-rich metamorphic rock, chiefly rhodonite (MnSiO₃), with quartz and manganese oxides
AI-generated identification · may be incorrectPink to rose-red, brown, and black mottling; generally vitreous to dull luster and massive, granular texture. Rhodonite has Mohs hardness 5.5–6.5, imperfect cleavage, and pink streak; black areas are commonly pyrolusite or other manganese oxides.
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Physical properties
Pink to rose-red, brown, and black mottling; generally vitreous to dull luster and massive, granular texture. Rhodonite has Mohs hardness 5.5–6.5, imperfect cleavage, and pink streak; black areas are commonly pyrolusite or other manganese oxides.
Formation & geological history
Formed when manganese-rich sediments or hydrothermal deposits were metamorphosed, commonly during regional metamorphism; precise age cannot be determined from the image. Weathering commonly darkens manganese minerals and produces brown-black patches.
Uses & applications
Used as an ornamental and carving stone when attractive, and collected as a mineral specimen; gem-quality rhodonite is cut into cabochons and beads. This irregular matrix material has limited construction value.
Geological facts
The specimen appears to contain abundant quartz-like reflective grains and dark manganese minerals, so it is not likely pure rhodonite. Rhodonite is the official state gemstone of Massachusetts, USA.
Field identification & locations
Identify by its salmon-pink color, black manganese veining, moderate hardness, and lack of strong acid reaction; a streak test and chemical/mineral analysis would confirm it. Common sources include Russia, Australia, Sweden, Peru, and the United States.
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