mineral

Orange Calcite

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 May 17, 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, chemical precipitation in caves, or as a byproduct of hydrothermal activity. It is common in limestone and marble formations of various geological ages.

Uses & applications

Primarily used for ornamental purposes such as spheres, carvings, and bookends. It is also used as a source of lime in agricultural and chemical industries, and by collectors for its aesthetic glow.

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 iron oxide impurities trapped within the crystal lattice.

Field identification & locations

Identify by its relative softness (can be scratched by a copper coin) and its strong effervescent reaction to dilute hydrochloric acid. It is commonly found in Mexico, Brazil, and the USA.