mineral

Polished yellow calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Translucent cream-yellow color with pearly to vitreous luster and visible cleavage planes; Mohs hardness 3, rhombohedral crystal structure, and specific gravity about 2.71. The elongated, polished shape is human-made from a mineral specimen.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms in limestone, hydrothermal veins, caves, and alkaline sediments through precipitation from carbonate-rich fluids. Most examples are geologically young to Paleozoic or younger, depending on the host deposit.

Uses & applications

Used for cement, lime, aggregate, soil treatment, and optical or decorative specimens; attractive transparent pieces are sold as carvings or metaphysical collectibles.

Geological facts

Calcite effervesces vigorously with dilute hydrochloric acid and shows strong birefringence, producing doubled images through clear pieces. Yellow coloration may result from iron, organic inclusions, or other trace impurities.

Field identification & locations

Identify it by its softness, rhombohedral cleavage, pale translucent appearance, and acid reaction; distinguish it from gypsum, which is softer and does not effervesce. Common sources include Mexico, the United States, Iceland, and China.