mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness of 3 on the Mohs scale, orange to yellow-orange color, vitreous to resinous luster, trigonal crystal system, perfect rhombohedral cleavage, specific gravity of approximately 2.71.

Identified July 29, 2026More mineral →

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Physical properties

Hardness of 3 on the Mohs scale, orange to yellow-orange color, vitreous to resinous luster, trigonal crystal system, perfect rhombohedral cleavage, specific gravity of approximately 2.71.

Formation & geological history

Forms in sedimentary, metamorphic, and igneous environments, primarily through the precipitation of calcium carbonate from hydrothermal solutions or marine waters.

Uses & applications

Used in decorative items, lapidary art, crystal healing, and as a source of calcium carbonate in various industrial applications.

Geological facts

Orange calcite is known for its bright citrus color caused by inclusions of iron. When treated with dilute hydrochloric acid, it will vigorously fizz due to the release of carbon dioxide.

Field identification & locations

Easily identified by its characteristic rhombohedral cleavage, softness (can be scratched by a copper coin), and effervescence in acid. Found worldwide, with notable deposits in Mexico.