Yellow Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale yellow to golden honey; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & Geological History

Forms in sedimentary environments through chemical precipitation from calcium-rich solutions, or in metamorphic marble. It is a common constituent of limestone and can form over various geological ages ranging from millions to billions of years ago.

Uses & Applications

Mainly used as a decorative specimen, in jewelry (though soft), for metaphysical healing purposes, and in industry for acid neutralization or as a component in cement when found in bulk limestone.

Geological Facts

Calcite is famous for its double refraction (birefringence) and reacts strongly to weak acids. Yellow calcite specifically is often associated with the solar plexus chakra in spiritual practices.

Field Identification & Locations

Can be identified by its softness (can be scratched by a copper penny) and its reaction to cold dilute hydrochloric acid (it will fizz). Commonly found in Mexico, Brazil, and the USA.

Identified on: 5/8/2026

Mode: Standard