mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale yellow to deep orange; Luster: Vitreous to waxy/resinous; Crystal System: Trigonal (rhombohedral); Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

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

Identified March 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, primarily in marine environments via chemical precipitation or biological activity, and as a primary mineral in igneous and metamorphic rocks (such as carbonatites and marbles). It can be found in rocks of almost any geological age.

Uses & applications

Industry: Manufacture of cement, lime, and fertilizers. Jewelry/Decorative: Used for carvings, spheres, and tumbled stones (though soft for rings). Scientific: Used in optical instruments due to its double refraction properties.

Geological facts

Calcite is one of the most common minerals on Earth. Its name is derived from the Greek word 'chalix' meaning lime. Orange calcite specifically gets its color from tiny inclusions of hematite or other iron oxides.

Field identification & locations

Identify in the field by its 'soapy' or waxy feel and rhombohedral cleavage. It will react and effervesce (fizz) immediately when exposed to cold dilute hydrochloric acid. It is commonly found in Mexico, Brazil, and the USA.