mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

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

Identified May 24, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through sedimentary processes, particularly by precipitation from calcium-rich solutions in caves or as the result of volcanic hydrothermal activity. It can be found in a wide variety of geological ages.

Uses & applications

Used primarily as decorative carvings, tumbled stones for collectors, 'healing' stones in metaphysical practices, and as a source of calcium in various industrial chemical processes.

Geological facts

Calcite is one of the most common minerals on Earth. Yellow calcite specifically gets its color from iron impurities. It shows strong double refraction (birefringence), meaning if you look through a clear piece, images appear doubled.

Field identification & locations

Identify in the field by its 3-way rhombohedral cleavage and its rapid effervescence (bubbling) when a drop of cold dilute hydrochloric acid or vinegar is applied. Common locations include Mexico, Brazil, and the USA.