mineral

Tumbled orange calcite

Calcite (calcium carbonate, CaCO₃)

AI-generated identification · may be incorrect

Hardness 3 Mohs; translucent cream-to-orange color with a waxy to glassy luster, commonly showing cloudy banding and prominent rhombohedral cleavage. The rounded shape indicates tumbling or polishing.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary limestones, hydrothermal veins, caves, and carbonatite settings; orange coloration commonly results from iron or other impurities. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Used for cement, lime, aggregate, and chemical production; attractive orange pieces are sold as inexpensive decorative or metaphysical collectibles. It is generally too soft for durable jewelry.

Geological facts

Calcite effervesces strongly in dilute hydrochloric acid and may fluoresce under ultraviolet light depending on impurities. It is optically birefringent and is a major component of limestone and marble.

Field identification & locations

Identify by its very low hardness, rhombohedral cleavage, and acid reaction; it can be scratched by a copper coin or steel knife. Common worldwide, especially in limestone regions and hydrothermal deposits.