mineral

Tumbled yellow calcite

Calcite (CaCO₃), likely honey or lemon calcite

AI-generated identification · may be incorrect

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.

Identified September 3, 2026More mineral →

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Physical properties

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.