mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Orange, honey-yellow; Luster: Vitreous to waxy/resinous; Crystal System: Trigonal (often found as rhombohedral fragments); Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Orange, honey-yellow
Luster: Vitreous to waxy/resinous

Identified July 9, 2026More mineral →

Explore Orange Calcite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through sedimentary processes such as precipitation from calcium-rich solutions in caves or marine environments, or as a secondary mineral in igneous and metamorphic rocks. Most specimens on the market are from the Holocene to Cenozoic era.

Uses & applications

Used primarily for decorative carvings, lapidary work (cabochons), as acid-neutralizing agents in industry, and widely collected by mineral enthusiasts for its vibrant color.

Geological facts

Orange Calcite often appears 'waxy' to the touch due to acid-washing treatments used by wholesalers to smooth the surface. It will vigorously effervesce (fizz) when in contact with dilute hydrochloric acid.

Field identification & locations

Identify in the field by its softness (readily scratched by a copper penny or steel knife) and its distinct rhombohedral cleavage. Commonly found in Mexico, Brazil, and the USA (Utah).