Orange Calcite

Physical Properties

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

Formation & Geological History

Formed through sedimentary processes, often as a precipitate in marine environments or groundwater. It is commonly found in sedimentary limestone or as a secondary mineral in veins or hydrothermal settings.

Uses & Applications

Predominantly used as a decorative stone, in lapidary work for carvings and tumbled stones, and highly valued in the metaphysical community for collecting.

Geological Facts

Orange calcite is known for its 'soapy' or waxy feel compared to quartz. When exposed to an acid like vinegar, it will effervesce (fizz) due to its carbonate composition.

Field Identification & Locations

Identify in the field by its softness (it can be scratched by a copper penny) and its characteristic rhombohedral cleavage. Commonly found in Mexico and Brazil.

Identified on: 4/23/2026

Mode: Standard