Yellow Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale yellow to deep honey; 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, primarily from the shells of marine organisms or as a chemical precipitate in caves (stalactites/stalagmites) and hot springs. It can occur in nearly any geological age.

Uses & Applications

Used as an acid neutralizer in chemical industries, in the manufacturing of cement, as a decorative gemstone or carving material, and widely collected by mineral enthusiasts for metaphysical study.

Geological Facts

Calcite is the most common form of natural calcium carbonate. It is known for its property of double refraction (birefringence), where light passing through a clear crystal is split into two rays.

Field Identification & Locations

Can be identified in the field by its softness (can be scratched by a copper coin) and its vigorous effervescence (bubbling) when in contact with weak hydrochloric acid or vinegar. Commonly found in limestone and marble quarries.

Identified on: 5/7/2026

Mode: Standard