mineral
Yellow calcite cabochon
Calcite (calcium carbonate, CaCO₃), likely honey/yellow calcite
AI-generated identification · may be incorrectHardness 3 Mohs; translucent yellow to honey coloration, vitreous to waxy luster, and commonly cloudy or mottled internal zoning. Trigonal crystal system with perfect rhombohedral cleavage; specific gravity about 2.71.
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Physical properties
Hardness 3 Mohs; translucent yellow to honey coloration, vitreous to waxy luster, and commonly cloudy or mottled internal zoning. Trigonal crystal system with perfect rhombohedral cleavage; specific gravity about 2.71.
Formation & geological history
Forms from calcium-rich hydrothermal fluids, cave deposits, or sedimentary carbonate alteration; yellow color commonly comes from iron or other trace impurities. The polished shape is human-processed, so its precise geological age cannot be determined.
Uses & applications
Used as a decorative cabochon, carving material, and collector specimen; calcite broadly supplies lime and cement, though this quality is mainly ornamental.
Geological facts
Calcite effervesces readily in cold dilute hydrochloric acid and shows strong birefringence, producing doubled images through clear pieces. It is much softer than quartz and scratches easily.
Field identification & locations
Identify by its low hardness, rhombohedral cleavage, and acid reaction; common sources include Mexico, Brazil, Iceland, and the United States. Avoid ultrasonic cleaners and harsh abrasion because polished calcite is fragile.
