mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: lemon yellow to honey gold; Luster: vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: perfect rhombohedral; Specific gravity: 2.71

Hardness: 3 on Mohs scale
Color: lemon yellow to honey gold
Luster: vitreous to waxy

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: lemon yellow to honey gold; Luster: vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: perfect rhombohedral; Specific gravity: 2.71

Formation & geological history

Formed in sedimentary environments through chemical precipitation in hot springs, caves, or as marine deposits. It can also be found in metamorphic marble or igneous carbonatites.

Uses & applications

Commonly used for tumbled stones, decorative carvings, metaphysical healing practices, and as a source of calcium in industrial applications like cement.

Geological facts

Yellow calcite is known to be fluorescent under UV light. It is one of the most common minerals on Earth, but the bright yellow variety is highly prized by collectors for its sunny appearance.

Field identification & locations

Can be identified by its softness (it can be scratched by a copper coin) and its effervescent reaction when exposed to weak acids like vinegar. Often found in Mexico, Brazil, and the USA.