mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale (can be scratched by a copper coin); Color: Pale to deep lemon yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale (can be scratched by a copper coin)
Color: Pale to deep lemon yellow
Luster: Vitreous to waxy

Identified April 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sedimentary environments through chemical precipitation or in metamorphic environments as marble. This specific tumbled specimen likely comes from hydrothermal veins or sedimentary deposits where calcium-rich fluids crystallized.

Uses & applications

Primarily used as a decorative stone, in lapidary work for carvings/spheres, and widely used by collectors. In industrial forms, calcite is used in cement, antacids, and as a soil conditioner.

Geological facts

Yellow calcite is often called 'the stone of the mind' by metaphysical collectors. Because it is a carbonate, it will effervesce (fizz) if a drop of weak acid like vinegar is applied to its surface.

Field identification & locations

Identify in the field by its softness (easily scratched), rhombohedral cleavage planes, and waxy luster when tumbled. Common locations include Mexico, USA (Uta/Arizona), and Brazil.