mineral

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Hardness: 3 on Mohs scale; Color: Orange to honey-gold; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: Orange to honey-gold
Luster: Vitreous to waxy

Identified April 5, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 3 on Mohs scale; Color: Orange to honey-gold; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral; Specific gravity: 2.71

Formation & geological history

Formed through sedimentary processes, often precipitated from calcium-rich solutions in hydrothermal veins, caves (as speleothems), or marine environments. Deposits can be hundreds of millions of years old.

Uses & applications

Commonly used for decorative carvings, lapidary work, cabochons for jewelry, and as a popular specimen for gemstone collectors and metaphysical enthusiasts.

Geological facts

Calcite is one of the most common minerals on Earth. It is famous for its double refraction and for reacting strongly (fizzing) with dilute hydrochloric acid. It is the primary constituent of limestone and marble.

Field identification & locations

Identify in the field by its rhombohedral cleavage, softness (can be scratched by a copper penny or knife), and acidic reaction. Commonly found in Mexico, Brazil, and the USA.