mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

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

Identified April 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitating from calcium-rich groundwater in caves or hot springs, or as a primary mineral in igneous environments like carbonatites. It can be found in layers of limestone or marble.

Uses & applications

Used as an acid neutralizer, pharmaceutical ingredient, livestock feed supplement, and extensively in crystal healing and home decor. It is also a source of lime for cement.

Geological facts

Calcite displays a unique property called double refraction; if you look through a clear piece, objects behind it appear doubled. It will effervesce (fizz) immediately when in contact with a weak acid like vinegar.

Field identification & locations

Identify it in the field by its distinctive waxy feel when tumbled and its softness (it can be scratched by a copper penny but not by a fingernail). Found globally, with notable deposits in Mexico, Brazil, and the USA.