mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

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

Identified February 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes or hydrothermal activity. It often precipitates from calcium-rich solutions in caves (stalactites/stalagmites) or hot springs. It is found in geological settings ranging from Precambrian to Holocene.

Uses & applications

Used primarily for metaphysical collecting, garden decor, and as a source of calcium in industrial cement production. Occasionally used in low-wear jewelry (pendants) due to its softness.

Geological facts

Calcite is the most common form of natural calcium carbonate. It is famous for its 'double refraction' property, where light passing through it splits into two rays, making objects behind it appear doubled.

Field identification & locations

Identify in the field by its distinct rhombohedral cleavage (slanted cube shapes) and its reaction to dilute hydrochloric acid (it will fizz). Commonly found in limestone quarries in Mexico, Brazil, and the USA.