mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange, peach, or honey-gold; 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, peach, or honey-gold
Luster: Vitreous to waxy

Identified May 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms through chemical precipitation in sedimentary environments, hydrothermal veins, or as a constituent of metamorphic marble. Generally occurs in karst landscapes or near hot springs.

Uses & applications

Used as a source of lime, in the manufacturing of cement, for decorative carvings, as a collector specimen, and in holistic healing practices.

Geological facts

Calcite exhibits double refraction; if you look through a clear piece, images appear doubled. It is one of the most common minerals on Earth's crust and is remarkably sensitive to acid.

Field identification & locations

Identify in the field by its rhombohedral cleavage (slanted cubes) and its rapid effervescence (fizzing) when a drop of cold dilute hydrochloric acid or vinegar is applied.