mineral

Tumbled orange calcite

Calcite (CaCO₃), likely orange/honey calcite

AI-generated identification · may be incorrect

Typically Mohs hardness 3, vitreous to pearly luster, translucent orange to honey color, and rhombohedral cleavage; the rounded shape indicates tumbling. It may show white cloudy zoning and reacts vigorously with dilute hydrochloric acid or vinegar (less reliably).

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms when calcium-rich groundwater precipitates in veins, cavities, caves, and sedimentary limestone; orange coloration commonly comes from iron or other trace impurities. Calcite deposits range from ancient to modern and cannot be dated from this image.

Uses & applications

Used as a decorative and collecting stone, as aggregate and a major industrial source of lime and cement; softer orange calcite is generally not suitable for jewelry exposed to abrasion.

Geological facts

Calcite is the principal mineral in limestone and marble and exhibits strong birefringence under polarized light. Its rhombohedral cleavage can produce angled chips despite its rounded polished surface.

Field identification & locations

Identify it by its low hardness, pale orange translucency, cleavage, and acid reaction; common sources include Mexico, Brazil, Peru, and the United States. Avoid confusing it with harder orange quartz or carnelian.