mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on the Mohs scale; Color: Honey-yellow to pale lemon; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Rhombohedral; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71

Hardness: 3 on the Mohs scale
Color: Honey-yellow to pale lemon
Luster: Vitreous to waxy

Identified March 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitating from calcium-rich hydrothermal solutions or in marine environments. It can also form as a secondary mineral in various geological settings through the alteration of other minerals.

Uses & applications

Used primarily as a decorative stone, in crystal healing practices, and as a source for calcium in chemical industries. High-grade specimens are used in lapidary work for carvings or spheres, though it is generally too soft for most jewelry.

Geological facts

Calcite is famous for its double refraction property (birefringence), where light passing through it splits into two rays. It is the primary component of limestone and marble. Yellow calcite is specifically associated with the solar plexus chakra in metaphysical beliefs.

Field identification & locations

Identify in the field by its rhombohedral cleavage (it breaks into tilted rectangles) and its strong effervescence (bubbling) when exposed to cold dilute hydrochloric acid. It is easily scratched by a copper penny or a steel knife. Common locations include Mexico, Brazil, and the USA.