Orange Calcite

Physical Properties

Hardness: 3 on Mohs scale (can be scratched by a copper coin or steel knife); Color: Orange to honey-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71

Formation & Geological History

Formed through sedimentary processes, often as chemical precipitates in marine environments or through the cooling of hydrothermal solutions. It is found in massive form in sedimentary limestone beds and metamorphic marble.

Uses & Applications

Commonly used as lapidary material for carvings, decorative stones, and 'healing' crystals in the metaphysical community. In industry, calcite is used for cement, agricultural lime, and as an optical component.

Geological Facts

Calcite is one of the most common minerals on Earth. Its name comes from the Greek word 'chalix', meaning lime. Orange calcite specifically gets its color from tiny inclusions of hematite or other iron oxides.

Field Identification & Locations

Identify in the field by its rhombohedral cleavage and its strong reaction (fizzing) to cold dilute hydrochloric acid. It is found globally, with major deposits in Mexico, Brazil, and the USA. Collectors should watch for its softness to avoid damage.

Identified on: 4/22/2026

Mode: Standard