Mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

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

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

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from marine environments or hydrothermal veins. It frequently occurs in massive forms or as crystals within limestone and marble deposits across various geological ages.

Uses & applications

Used primarily as decorative carvings, tumbled stones for collectors, and in the metaphysical industry. Industrial grade calcite is used in cement, agriculture, and as a filler for paints and plastics.

Geological facts

Yellow calcite is known as a 'solar' stone in various cultures. It is famous for its extreme doubling effect (double refraction), though this is harder to see in tumbled specimens like the one pictured. It will effervesce (fizz) if a drop of weak acid is applied.

Field identification & locations

Identify in the field by its characteristic softness (can be scratched by a copper penny or steel knife) and its reaction to acid. It is commonly found in Mexico, Brazil, and the USA. Collectors should look for its waxy feel and rhombohedral cleavage planes seen inside the stone.