mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

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

Hardness: 3 on Mohs scale
Color: Pale yellow to deep honey gold
Luster: Vitreous to waxy

Identified July 18, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through sedimentary processes, primarily from the shells and skeletons of marine organisms or as a chemical precipitate in caves (stalactites/stalagmites) and thermal springs.

Uses & applications

Used as an acid neutralizer in chemical industries, a flux in metallurgy, an ornamental stone in carving, and a popular metaphysical specimen for collectors.

Geological facts

Calcite is one of the most common minerals on Earth and the primary component of limestone and marble. High-purity yellow calcite is often translucent and exhibits beautiful double refraction if clear enough.

Field identification & locations

Identify in the field by its rhombohedral cleavage and its vigorous reaction (effervescence) when touched by dilute hydrochloric acid. It can be easily scratched by a copper coin or a knife.