mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey-orange; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71

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

Identified March 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from groundwater in caves or hot springs, or through marine environments where calcium and carbonate ions concentrate. It can be found in rocks of various geological ages ranging from the Paleozoic to the Cenozoic.

Uses & applications

Predominantly used for ornamental purposes, lapidary work (cabochons, carvings), and as a metaphysical/collecting specimen. In industrial forms, calcite is used in cement, antacids, and soil treatments.

Geological facts

Orange calcite is known for its ability to fluoresce under UV light. It is one of the most common minerals on Earth, but the vibrant orange hue is caused by inclusions of hematite or other iron oxides during formation.

Field identification & locations

Identify in the field by its rhombohedral cleavage (tilting cubes) and its reaction to cold dilute hydrochloric acid (it will fizz). Commonly found in Mexico, Brazil, and the USA. Collectors should look for its distinctive waxy feel.