mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale yellow to lemon yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

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

Identified April 5, 2026More mineral →

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Physical properties

Hardness: 3 on Mohs scale; Color: Pale yellow to lemon yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & geological history

Formed through sedimentary processes, such as precipitation from calcium-rich water or as biological secretions in marine environments. It can also occur in metamorphic marble and igneous carbonatites.

Uses & applications

Used widely in the manufacturing of cement and mortar, as a soil neutralizer in agriculture, as an ornamental stone in jewelry (tumbled stones), and as a metaphysical healing crystal.

Geological facts

Calcite is one of the most common minerals on Earth and is the primary constituent of limestone and marble. The 'yellow' variety often gets its color from iron impurities incorporated into the crystal lattice during formation.

Field identification & locations

Can be identified in the field by its softness (scratched by a copper penny or knife) and its diagnostic reaction to dilute hydrochloric acid, which causes it to effervesce (fizz) vigorously.