mineral

Polished/tumbled pale-yellow stone, possibly calcite

Likely calcite (CaCO₃); identification is uncertain from the image alone

AI-generated identification · may be incorrect

Smooth, rounded, cream-to-yellow with translucent patches and a visible fracture or vein. If calcite, hardness is 3 Mohs, luster vitreous to pearly, and crystals are trigonal with perfect rhombohedral cleavage; the polish obscures diagnostic features.

Identified September 26, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms in sedimentary limestones and caves, or in hydrothermal veins; it occurs from many geological ages. This piece appears mechanically polished, but its source rock cannot be determined visually.

Uses & applications

Small polished calcite pieces are used for collecting and decoration; calcite also has major uses in cement, lime, and aggregates.

Geological facts

Calcite effervesces in dilute acid and is readily scratched by a copper coin, useful checks on an uncoated specimen.

Field identification & locations

The rounded shape and glossy surface indicate tumbling or polishing. Confirm with hardness and an acid test; similar-looking stones include chalcedony and feldspar.