mineral
Tumbled orange calcite
Calcite (CaCO₃)
AI-generated identification · may be incorrectOrange to reddish-orange, translucent in places, with a vitreous to pearly luster and visible cleavage surfaces. Mohs hardness 3; trigonal crystal system; rhombohedral cleavage; specific gravity about 2.7.
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Physical properties
Orange to reddish-orange, translucent in places, with a vitreous to pearly luster and visible cleavage surfaces. Mohs hardness 3; trigonal crystal system; rhombohedral cleavage; specific gravity about 2.7.
Formation & geological history
Calcite forms in many settings, including sedimentary limestones, hydrothermal veins, and cavities. Orange color commonly comes from iron-bearing impurities; the image does not establish its geological age or source.
Uses & applications
Used as a decorative and collector stone; calcite also has major industrial uses in cement, lime, and aggregate.
Geological facts
Calcite effervesces in dilute acid and is readily scratched by a steel knife. Orange calcite is often sold polished or tumbled.
Field identification & locations
Look for its relatively low hardness, cleavage, and acid reaction; common sources include Mexico, Brazil, and the United States. The polished shape indicates human processing.
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Gypsum (variety Selenite or Alabaster)
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Mineral