mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Identified June 22, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms through chemical precipitation in sedimentary environments, often in caves as stalactites or in marine settings. It can also form through hydrothermal activity. Found in many geological ages from Precambrian to Holocene.

Uses & applications

Used in the manufacturing of cement and lime, as a soil conditioner in agriculture, as decorative stones, and in the metaphysical or gemstone collecting market.

Geological facts

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

Field identification & locations

Identified in the field by its rhombohedral cleavage and its rapid effervescence (bubbling) when exposed to dilute hydrochloric acid. It is much softer than quartz. Found commonly in Mexico, Brazil, and the USA.