mineral

Orange calcite crystal cluster

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Small translucent orange crystals with a vitreous to slightly pearly luster; calcite has Mohs hardness 3, trigonal crystal structure, and perfect rhombohedral cleavage. The orange color commonly comes from iron-bearing impurities or inclusions.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Calcite forms in sedimentary and hydrothermal environments, including limestone cavities and mineral veins; the specimen’s exact age and locality cannot be determined from the image.

Uses & applications

Collected as a mineral specimen and sometimes used for ornaments; calcite is also used in cement, lime, and industrial fillers.

Geological facts

Calcite fizzes in dilute acid and is distinctly softer than a knife blade; orange coloration is not enough to identify a specific variety or locality.