mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3 (Mohs scale), Color: light yellow to deep orange/golden, Luster: Vitreous to waxy, Crystal structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral in three directions, Specific gravity: 2.71
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Physical properties
Hardness: 3 (Mohs scale), Color: light yellow to deep orange/golden, Luster: Vitreous to waxy, Crystal structure: Trigonal/Rhombohedral, Cleavage: Perfect rhombohedral in three directions, Specific gravity: 2.71
Formation & geological history
Formed through sedimentary processes, chemical precipitation in caves, or as a byproduct of hydrothermal activity. It is common in limestone and marble environments across all geological eras.
Uses & applications
Used in the manufacture of cement, lime for soil treatment, as a pigment, in acid neutralization, and widely as a decorative stone or 'healing' crystal in the New Age community.
Geological facts
Calcite is the most common form of calcium carbonate and is known for its property of double refraction, where light entering the crystal is split into two rays. It reacts instantly with weak acids like vinegar by fizzing.
Field identification & locations
Identified in the field by its 3-way rhombohedral cleavage, its softness (can be scratched by a copper coin), and its effervescence with HCl. Commonly found in Mexico, Brazil, and the USA.
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