Yellow Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale yellow to golden honey; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71

Formation & Geological History

Formed through sedimentary processes such as chemical precipitation in marine environments, or in hydrothermal veins and hot springs. It can found in limestone and marble formations of various geological ages.

Uses & Applications

Used in the manufacture of cement and mortar, as a soil conditioner in agriculture, and as a popular decorative stone or tumbled gemstone for collectors and metaphysical use.

Geological Facts

Calcite exhibits double refraction (Iceland Spar), where light passing through a clear specimen splits into two rays. It is the primary component of stalactites and stalagmites in caves.

Field Identification & Locations

Identify in the field by its softness (can be scratched by a copper penny) and its strong reaction (fizzing) when exposed to cold dilute hydrochloric acid or vinegar.

Identified on: 4/23/2026

Mode: Standard