Orange Calcite (Banded Calcite)

Physical Properties

Hardness: 3 on Mohs scale; Color: Honey-orange with cream banding; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & Geological History

Formed through the deposition of calcium carbonate in aqueous environments, often in caves as flowstone or around hot springs, resulting in distinct parallel banding layers.

Uses & Applications

Used primarily for ornamental carvings, decorative sculptures, metaphysical use, and lapidary items such as the pumpkin shape shown.

Geological Facts

Orange calcite is often mistakenly marketed as 'Orange Onyx' due to its banding, but it is actually a carbonate mineral. It is famous for its bright, sunny colors caused by iron inclusions.

Field Identification & Locations

Identify by its softness (can be scratched by a copper coin) and strong effervescence when exposed to weak acid. Common in Mexico, Brazil, and the USA.

Identified on: 4/29/2026

Mode: Standard