Orange Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale orange to deep honey orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Formation & Geological History

Forms in sedimentary environments through chemical precipitation or as a primary mineral in igneous and metamorphic rocks. It often forms through the carbon cycle or in hydrothermal veins.

Uses & Applications

Used primarily for ornamental purposes, lapidary carvings, tumbled stones, and in the manufacturing of cement and lime. It is also a popular specimen for gemstone collectors and metaphysical practitioners.

Geological Facts

Calcite is one of the most common minerals on Earth. Its name is derived from the Greek word 'chalix' meaning lime. When exposed to ultraviolet light, many specimens exhibit strong fluorescence.

Field Identification & Locations

Identify in the field by its softness (it can be scratched by a copper coin) and its effervescence (bubbling) when in contact with weak acids like vinegar. Common locations include Mexico, Brazil, and the USA.

Identified on: 5/13/2026

Mode: Standard