mineral
Orange calcite (rough specimen)
Calcite, CaCO₃
AI-generated identification · may be incorrectLikely translucent orange calcite with a vitreous to pearly luster and uneven, stepped cleavage surfaces. Mohs hardness 3; trigonal crystal system; perfect rhombohedral cleavage; specific gravity about 2.7.
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Physical properties
Likely translucent orange calcite with a vitreous to pearly luster and uneven, stepped cleavage surfaces. Mohs hardness 3; trigonal crystal system; perfect rhombohedral cleavage; specific gravity about 2.7.
Formation & geological history
Forms when calcium-carbonate-rich fluids precipitate in veins, cavities, or sedimentary settings; orange color commonly comes from iron impurities. The image does not establish its geological age or locality.
Uses & applications
Used as a decorative and collecting mineral; calcite also has major industrial uses in cement, lime, and agricultural products, though this small specimen is not suitable for those applications.
Geological facts
Calcite effervesces in dilute acid and is readily scratched by a steel knife. Orange color alone is not diagnostic; similar specimens may be aragonite or another carbonate.
Field identification & locations
Check for hardness near 3, rhombohedral cleavage, and vigorous fizzing with dilute acid. Common worldwide in limestone caves, hydrothermal veins, and sedimentary deposits; handle gently because it is soft.
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