Yellow Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale to deep yellow-orange; Luster: Vitreous to resinous; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71

Formation & Geological History

Formed through sedimentary processes, often as a precipitate from calcium-rich groundwater or in hydrothermal veins and marine environments. It is a common constituent of limestone and marble.

Uses & Applications

Used as a major component of cement and mortar in construction, as an acid neutralizer in chemical industries, as an optical cleaner, and frequently as a tumbled stone or carving material for collectors.

Geological Facts

Calcite is famous for its double refraction property (Iceland Spar), where light passing through it splits into two rays. Yellow calcite is specifically associated with the solar plexus chakra in metaphysical beliefs.

Field Identification & Locations

Identified in the field by its softness (scratched by a copper coin) and its immediate effervescence (bubbling) when in contact with dilute hydrochloric acid. Commonly found in Mexico, USA, and Brazil.

Identified on: 5/2/2026

Mode: Standard