mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Honey-yellow to deep orange; Luster: Vitreous to waxy/resinous; Crystal System: Trigonal (often found as massive or rhombohedral cleavage fragments); Cleavage: Perfect rhombohedral in three directions; Gravity: 2.71

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

Identified July 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms through chemical precipitation in sedimentary environments, hydrothermal veins, or as a byproduct of volcanic activity. Often found in limestone caves or as a secondary mineral in igneous rock cavities.

Uses & applications

Used primarily in lapidary work for carvings and decorative items, crystal healing collections, as an acid neutralizer in chemical industries, and as a calcium supplement in animal feed.

Geological facts

Calcite is one of the most common minerals on Earth, but the bright orange variety is specifically prized for its vibrant color caused by hematite inclusions. It exhibits a unique physical property where it reacts strongly (fizzes) with cold hydrochloric acid.

Field identification & locations

Identify in the field by its distinct waxy texture, rhombohedral cleavage, and low hardness (it can be scratched by a copper penny). Common locations include Mexico, Brazil, and the USA (Utah).