mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Identified July 14, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through sedimentary processes, often precipitating from calcium-rich solutions in marine environments or through hydrothermal activity. It is found in massive form within limestone and marble deposits.

Uses & applications

Mainly used as a decorative stone, in lapidary work for carvings and spheres, and highly popular in the metaphysical and gem collecting communities.

Geological facts

Orange calcite is known for its 'acid-washed' or waxy feel when polished. It is often used as a source of calcium in industrial applications and is highly sensitive to acids, which will cause it to effervesce.

Field identification & locations

Identify by its orange color, distinct rhombohedral cleavage planes, and low hardness (it can be scratched by a copper penny). It is commonly found in Mexico, Brazil, and the USA (Utah).