mineral

Honey calcite crystal

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Hardness 3; translucent pale honey-yellow color, vitreous to pearly luster, and commonly rhombohedral cleavage. The elongated form appears to be a cleavage- or growth-modified calcite crystal, though quartz is a possible look-alike.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Calcite precipitates from carbonate-rich groundwater, hydrothermal fluids, or sedimentary cavities; specimens may range from modern to hundreds of millions of years old. Exact age and locality cannot be determined from the image.

Uses & applications

Used for cement, lime, aggregate, and chemical production; transparent crystals are collected and occasionally used decoratively. It is softer and less durable than quartz for jewelry.

Geological facts

Calcite effervesces strongly in dilute hydrochloric acid, unlike most quartz. Double refraction through clear calcite is a useful diagnostic feature.

Field identification & locations

Common in limestone cavities, caves, veins, and hydrothermal deposits worldwide, including Mexico, Iceland, the United States, and China. Confirm with acid reaction, hardness testing, and cleavage; avoid scratching valuable specimens.