Orange Calcite

Physical Properties

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

Formation & Geological History

Forms through chemical precipitation in sedimentary environments, hot springs, and caves, or through metamorphism of limestone. This specimen has been carved and polished into an egg shape.

Uses & Applications

Commonly used for lapidary work, decorative carvings, metaphysical collection, and as a source of lime in industrial chemical processes.

Geological Facts

Calcite is one of the most common minerals on Earth, but orange varieties get their distinct color from hematite or other iron-oxide inclusions trapped during the growth process.

Field Identification & Locations

Identify in the field by its softness (can be scratched by a copper coin) and its effervescence (bubbles) when in contact with weak hydrochloric acid. Commonly found in Mexico and Brazil.

Identified on: 5/1/2026

Mode: Standard