mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Identified July 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often as a precipitate in marine environments or through hydrothermal activity in limestone cavities. It typically develops in the Cenozoic era environments but can be found in much older strata.

Uses & applications

Used primarily for decorative carvings, lapidary work, cabochons for jewelry, and as a popular specimen for crystal collectors. In industrial forms, calcite is used in cement and agriculture.

Geological facts

Calcite is one of the most common minerals on Earth. Its name comes from the Greek word 'chalix', meaning lime. Orange calcite is often acid-washed or tumble-polished to give it its characteristic smooth, waxy feel.

Field identification & locations

Identify by its relative softness (can be scratched by a copper coin) and its reaction to dilute hydrochloric acid (it will effervesce/fizz). Commonly found in Mexico, Brazil, and the USA. Collectors should look for its distinctive soapy texture and rhombohedral cleavage planes.