mineral
Tumbled yellow calcite
Calcite (CaCO₃), likely honey or lemon calcite
AI-generated identification · may be incorrectPale yellow, translucent, waxy-to-vitreous luster, and typically cloudy banding or internal veils; calcite has Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71. The rounded shape indicates tumbling and polishing.
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Physical properties
Pale yellow, translucent, waxy-to-vitreous luster, and typically cloudy banding or internal veils; calcite has Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.71. The rounded shape indicates tumbling and polishing.
Formation & geological history
Forms commonly in limestone, marble, hydrothermal veins, and cave deposits when calcium-rich fluids precipitate carbonate. Calcite occurs from Precambrian to modern geological environments; exact age cannot be determined from the specimen.
Uses & applications
Used for cement, lime, aggregate, optical applications, and carbonate fillers; attractive polished pieces are sold as inexpensive decorative or metaphysical stones.
Geological facts
Calcite effervesces vigorously with dilute hydrochloric acid and shows strong double refraction in clear pieces. Yellow coloration commonly results from iron, organic material, or other trace impurities.
Field identification & locations
Identify it by its softness, rhombohedral cleavage, pale yellow translucency, and acid reaction; common localities include Mexico, Brazil, China, Iceland, and the United States. Avoid abrasive wear and acids.
