mineral

Yellow Calcite (Polished)

Calcium Carbonate (CaCO3)

Mohs hardness: 3; Color: pale yellow to honey gold; Luster: vitreous to waxy (when polished); Crystal structure: Trigonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Hardness: 3
Color: pale yellow to honey gold
Luster: vitreous to waxy (when polished)

Identified July 20, 2026More mineral →

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Physical properties

Mohs hardness: 3; Color: pale yellow to honey gold; Luster: vitreous to waxy (when polished); Crystal structure: Trigonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & geological history

Formed through chemical precipitation in sedimentary environments such as hot springs, limestone caverns, and marine settings, or through hydrothermal veins and metamorphic marble formation.

Uses & applications

Used as a gemstone for carving, decorative palm stones, and in crystal healing practices. Industrially, calcite is used in building materials, agricultural lime, and pharmaceuticals.

Geological facts

Calcite is known for its property of double refraction (birefringence), though this is harder to see in opaque/massive yellow varieties compared to clear Iceland Spar. It is one of the most common minerals on Earth.

Field identification & locations

Can be identified by its softness (can be scratched by a copper coin) and its violent effervescence when exposed to weak acids like vinegar. Common in Mexico, Brazil, and the USA.