mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: bright yellow to honey gold; Luster: vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

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

Identified July 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from calcium-rich groundwater in caves or hydrothermal veins. It can be found in various geological ages depending on the deposit location.

Uses & applications

Used as an ornamental stone, in metaphysical practices for energy cleansing, as a source of calcium in industry, and highly collected by mineral enthusiasts for its color.

Geological facts

Yellow calcite is known for its strong double refraction; if you place a clear piece over printed text, the words appear doubled. It is also often fluorescent under UV light.

Field identification & locations

Identified in the field by its rhombohedral cleavage, softness (can be scratched by a copper penny), and its vigorous effervescence when exposed to cold dilute hydrochloric acid. Commonly found in Mexico, Brazil, and the USA.