mineral

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Hardness: 3 on Mohs scale; Color: Pale orange to deep orange; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: Pale orange to deep orange
Luster: Vitreous to waxy

Identified February 4, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale orange to deep orange; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Formation & geological history

Formed through sedimentary processes, often precipitated from marine environments or hydrothermal veins. This water-worn specimen likely originated from a limestone or marble deposit and was smoothed by river or coastal erosion.

Uses & applications

Commonly used for ornamental carvings, tumble polishing for metaphysical collectors, laboratory-grade calcium, and as an ingredient in cement and soil treatment when crushed.

Geological facts

Orange calcite gets its distinct hue from trace inclusions of hematite or iron oxide. It is famous for its 'double refraction' property, where text viewed through a clear crystal appears doubled.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper coin) and its effervescent reaction to diluted hydrochloric acid (it will bubble/fizz). Commonly found in Mexico, Brazil, and the USA.

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