Orange Calcite

Physical Properties

Hardness: 3 on Mohs scale (soft); Color: translucent orange to honey yellow; Luster: vitreous to waxy; Crystal Structure: Trigonal; Cleavage: perfect rhombohedral in three directions; Specific Gravity: 2.71

Formation & Geological History

Formed through sedimentary processes, often as chemical precipitates in caves or hot springs, or as sea shells that have been compressed. It can also be found in igneous hydrothermal veins.

Uses & Applications

Used primarily as decorative carvings, ornamental stones, and in the metaphysical/collecting community. Industrially, calcite is used in building materials, agricultural lime, and pharmaceuticals.

Geological Facts

Orange calcite is known for its 'soapy' or waxy feel when polished. It will effervesce (fizz) if a drop of cold dilute hydrochloric acid or vinegar is applied due to its carbonated nature.

Field Identification & Locations

Identify in the field by its softness (can be scratched by a copper coin or a steel knife) and its distinct rhombohedral cleavage. Commonly found in Mexico, USA, and Brazil. Collectors look for vibrant saturation and translucency.

Identified on: 5/6/2026

Mode: Standard