Yellow Calcite

Physical Properties

Hardness: 3 on Mohs scale; Color: Pale yellow to deep golden; Luster: Vitreous to waxy; Crystal System: Trigonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & Geological History

Formed through sedimentary processes, chemical precipitation in caves (as stalactites/stalagmites), or in hydrothermal veins. Found in various geological settings ranging from Precambrian to recent times.

Uses & Applications

Used primarily for ornamental purposes, jewelry (pendants/beads), metaphysical practices, and as a source of calcium in industrial chemical applications.

Geological Facts

Yellow Calcite is known for its ability to double-refract light (birefringence). It is also highly reactive to dilute hydrochloric acid, which causes it to effervesce or fizz.

Field Identification & Locations

Identify in the field by its rhombohedral cleavage and relative softness (can be scratched by a copper coin). It is commonly found in Mexico, Brazil, and the USA. Collectors look for clarity and intensity of the honey-yellow hue.

Identified on: 4/24/2026

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