mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Yellow, honey, or lemon; Luster: Vitreous to waxy; Crystal structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: Yellow, honey, or lemon
Luster: Vitreous to waxy

Identified April 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, primarily from the chemical precipitation of calcium carbonate from marine environments or in caves as speleothems. It can also occur in hydrothermal veins.

Uses & applications

Used as a decorative stone, in metaphysical practices, as a source of lime for cement, and occasionally as a minor gemstone for collectors despite its softness.

Geological facts

Calcite is the most common form of calcium carbonate and is known for its property of double refraction (birefringence). The yellow variety is often associated with self-confidence and hope in spiritual circles.

Field identification & locations

Identify in the field by its 3-way rhombohedral cleavage and its rapid effervescence (fizzing) when exposed to cold dilute hydrochloric acid. It is easily scratched by a copper coin or steel knife.