metamorphic
Rhodonite-bearing metamorphic rock (likely rhodonite schist or altered manganese-rich rock)
Rhodonite (MnSiO₃) with probable quartz, feldspar, and/or manganese silicates
AI-generated identification · may be incorrectPink to reddish-purple rhodonite occurs with gray, granular matrix and dark veining; typically vitreous to pearly luster, triclinic crystal structure, perfect prismatic cleavage, Mohs hardness about 5.5–6.5, and specific gravity ~3.4–3.7. The specimen appears naturally rough and triangular from fracturing.
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Physical properties
Pink to reddish-purple rhodonite occurs with gray, granular matrix and dark veining; typically vitreous to pearly luster, triclinic crystal structure, perfect prismatic cleavage, Mohs hardness about 5.5–6.5, and specific gravity ~3.4–3.7. The specimen appears naturally rough and triangular from fracturing.
Formation & geological history
Forms when manganese-rich sediments or hydrothermal deposits undergo metamorphism, commonly during Precambrian to younger regional metamorphic events. Exact age and locality cannot be determined from the photograph.
Uses & applications
Rhodonite is used as an ornamental stone, carving material, lapidary rough, and occasionally jewelry; the associated rock has little industrial use. Attractive pink specimens are collected.
Geological facts
Rhodonite’s pink color may darken or weather to black manganese oxides, producing characteristic veins and surface coatings.
Field identification & locations
Look for opaque rose-pink color, black veining, moderate hardness, and dense granular texture; distinguish it from rhodochrosite, which is softer and commonly more vividly banded. Common sources include Russia, Australia, Sweden, Peru, South Africa, and the United States.
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