mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Yellow to deep orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Yellow to deep orange
Luster: Vitreous to waxy

Identified July 13, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Yellow to deep orange; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & geological history

Formed through chemical precipitation in sedimentary environments, hydrothermal veins, or as a constituent of metamorphic marble. It is a common rock-forming mineral found worldwide.

Uses & applications

Used in the manufacturing of cement and lime, as an acid neutralizer in the chemical industry, in soil remediation, and as polished decorative stones or tumbled pocket stones for collectors.

Geological facts

Calcite is famous for its double refraction (birefringence), where light passing through a clear crystal splits into two rays. Yellow calcite specifically is often associated with the solar plexus chakra in metaphysical beliefs.

Field identification & locations

Can be identified in the field by its softness (can be scratched by a copper coin) and its vigorous reaction (effervescence) to dilute hydrochloric acid. It is commonly found in limestone quarries and caves.