mineral
Orange calcite (likely honey calcite)
Calcite, calcium carbonate (CaCO₃)
AI-generated identification · may be incorrectOrange-yellow, opaque to translucent, with a dull-to-vitreous luster and granular crystalline texture; Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71. The rough surface and strong orange color may reflect iron staining or inclusions.
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Physical properties
Orange-yellow, opaque to translucent, with a dull-to-vitreous luster and granular crystalline texture; Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71. The rough surface and strong orange color may reflect iron staining or inclusions.
Formation & geological history
Forms mainly in sedimentary limestone, hydrothermal veins, and cavities, commonly through precipitation from calcium-rich groundwater; the specimen’s exact age and locality cannot be determined from the image.
Uses & applications
Used as a collector specimen, ornamental stone, and occasionally for carbonate aggregate or lime production; gem-quality transparent orange calcite is uncommon and relatively soft.
Geological facts
Calcite effervesces vigorously in dilute hydrochloric acid and shows strong birefringence, producing doubled images through clear pieces. Orange coloration commonly results from iron or other trace-element impurities.
Field identification & locations
Identify it by its orange color, rhombohedral cleavage, softness, and acid reaction; common sources include Mexico, Brazil, the United States, and Europe. Avoid confusing it with harder orange aragonite or quartz.
