mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Identified March 17, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from marine environments or hydrothermal veins. It can also form in hot spring deposits as calcium-rich waters evaporate or change temperature. It is found in geological formations across various eras, particularly those involving limestone.

Uses & applications

Primarily used as a decorative stone in interior design, carvings, and tumbled stones for mineral collectors. In industry, calcite is used for the production of cement and lime, and as a soil conditioner in agriculture.

Geological facts

Orange calcite is known for its strong double refraction (birefringence); if you look through a clear specimen, you see double. It is one of the most common minerals on Earth, constituting a large portion of the crust's sedimentary rocks.

Field identification & locations

Identify in the field by its softness (can be scratched by a copper coin) and its effervescence when exposed to cold dilute hydrochloric acid. Commonly found in Mexico, Brazil, and the USA. Collectors look for vibrant saturation and translucency.