mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

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

Hardness: 3 on Mohs scale
Color: Pale yellow to golden yellow
Luster: Vitreous to waxy/greasy

Identified June 5, 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 is found in rocks of all geological ages, primarily in limestone and marble environments.

Uses & applications

Used as a decorative stone, in jewelry (carvings/beads), as a source of lime for cement, and widely collected by mineral enthusiasts for its color and optical properties.

Geological facts

Calcite exhibits double refraction; if you place a transparent piece over a line, you will see two lines. Yellow calcite is often used in alternative healing practices to represent the solar plexus chakra.

Field identification & locations

Identify by its 'soapy' feel, rhombohedral cleavage, and extreme softness (can be scratched by a copper penny). It will effervesce (fizz) vigorously when in contact with cold dilute hydrochloric acid. Commonly found in Mexico, USA, and Brazil.