mineral

Likely iron-stained calcite

Calcite (CaCO₃), possibly colored by iron-oxide impurities

AI-generated identification · may be incorrect

Pale honey-gold, translucent in thin areas, with a vitreous to pearly luster and irregular cleavage surfaces. Calcite has Mohs hardness 3, trigonal crystal structure, and specific gravity about 2.7; hardness and cleavage cannot be confirmed from the image.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms in limestone cavities, veins, and hydrothermal deposits as mineral-rich water precipitates calcium carbonate. Its age cannot be determined from appearance alone.

Uses & applications

Calcite is used in cement, lime, aggregate, and as a mineral specimen; attractive transparent varieties may be collected or cut, though this piece appears rough and modest in quality.

Geological facts

Calcite effervesces in dilute acid and is readily scratched by a steel knife. Its distinctive rhombohedral cleavage can help distinguish it from quartz, which is much harder and lacks cleavage.

Field identification & locations

The golden color and blocky, somewhat translucent appearance suggest calcite, but visual identification is uncertain; a hardness test and acid reaction would help. Calcite is widespread in carbonate rocks worldwide.