mineral
Orange calcite (rough cleavage fragment)
Calcite, CaCO₃
AI-generated identification · may be incorrectHardness 3 Mohs; translucent orange to reddish-brown, vitreous to pearly luster, trigonal crystal structure, and prominent rhombohedral cleavage. The stepped, layered-looking faces are consistent with calcite cleavage.
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Physical properties
Hardness 3 Mohs; translucent orange to reddish-brown, vitreous to pearly luster, trigonal crystal structure, and prominent rhombohedral cleavage. The stepped, layered-looking faces are consistent with calcite cleavage.
Formation & geological history
Forms when calcium-carbonate-rich fluids precipitate in veins, cavities, and sedimentary settings; calcite occurs in rocks of many geological ages. Orange color commonly comes from iron staining or other trace impurities.
Uses & applications
Used in cement and lime production; attractive orange specimens are collected or used as decorative material, though this piece is not gem-grade.
Geological facts
Calcite effervesces in dilute acid and is readily scratched by a copper coin; a clear variety can show double refraction.
Field identification & locations
Look for rhombohedral cleavage and relatively low hardness; common worldwide in limestone, caves, and hydrothermal veins. The image alone cannot confirm the mineral, but its appearance strongly suggests orange calcite.
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