mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange to reddish-orange with white veining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: Orange to reddish-orange with white veining
Luster: Vitreous to waxy

Identified July 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes or as a secondary mineral in igneous and metamorphic rocks. Often originates from marine environments via chemical precipitation or the accumulation of shell and coral debris.

Uses & applications

Commonly used for decorative carvings, lapidary work (cabochons), as metaphysical specimens, and in the chemical industry for acid neutralization.

Geological facts

Calcite is one of the most common minerals on Earth and is the primary component of limestone and marble. Orange calcite specifically gets its vibrant hue from tiny inclusions of hematite or other iron oxides.

Field identification & locations

Can be identified by its softness (easily scratched by a copper penny or steel) and its vigorous effervescence when exposed to cold dilute hydrochloric acid/vinegar. Look for the distinct rhombohedral cleavage planes.