mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

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

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

Identified June 3, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through sedimentary processes, primarily from the chemical precipitation of calcium-rich solutions in caves, hot springs, or as marine deposits. This specimen appears water-worn or tumbled.

Uses & applications

Primarily used as decorative stones, gemstones for jewelry (though soft), acid neutralizers in industry, and as metaphysical 'healing' stones by collectors.

Geological facts

Calcite is the most common mineral in the world after quartz. It exhibits double refraction (birefringence), where light passing through it splits into two rays, making things behind it look double.

Field identification & locations

Identify in the field by its 3-way rhombohedral cleavage and its energetic reaction (fizzing) when exposed to dilute hydrochloric acid. It is significantly softer than quartz and can be scratched by a copper coin.