mineral
Orange calcite (rough specimen)
Calcite, CaCO₃
AI-generated identification · may be incorrectTypically Mohs hardness 3; orange to honey-colored, vitreous to waxy luster, trigonal crystal structure, and prominent rhombohedral cleavage. The photo’s color and irregular cleavage surfaces are consistent with calcite, though visual identification is not definitive.
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Physical properties
Typically Mohs hardness 3; orange to honey-colored, vitreous to waxy luster, trigonal crystal structure, and prominent rhombohedral cleavage. The photo’s color and irregular cleavage surfaces are consistent with calcite, though visual identification is not definitive.
Formation & geological history
Forms in sedimentary and hydrothermal settings, including limestone caves and veins; calcite occurs in rocks of many geological ages. Orange color commonly results from trace iron or other impurities.
Uses & applications
Used in cement and lime production, as a soil treatment and industrial filler; attractive pieces are collected or sold as decorative specimens.
Geological facts
Calcite effervesces strongly in dilute hydrochloric acid and can show double refraction in clear crystals.
Field identification & locations
Look for softness, rhombohedral cleavage, and acid reaction; common worldwide, especially in limestone regions. A small rough specimen like this typically sells for about $2–$15 USD.
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