Yellow Calcite
Calcite · Mineral Specimen
Crystal System
Trigonal, massive to rhombohedral habit
Mineral Group
Carbonates
Chemical Formula
CaCO3
Formation Process
Sedimentary, metamorphic, and hydrothermal environments
About This Crystal
A pale yellow, translucent to opaque raw mineral chunk with a waxy to vitreous luster and distinct cleavage planes.
Physical Characteristics
Yellow color, white streak, perfect rhombohedral cleavage in three directions, conchoidal to uneven fracture, specific gravity of 2.71, brittle tenacity
Optical Properties
Strong birefringence (double refraction), uniaxial negative, refractive index of 1.486 to 1.658
Hardness & Durability
Origin Region
Mexico, Brazil, USA, Madagascar
Hardness & Durability
Mohs hardness of 3, poor toughness due to perfect cleavage, sensitive to acids, not recommended for everyday jewelry
Care & Maintenance
Clean with a soft, damp cloth; avoid harsh chemicals, acids, prolonged water immersion, and direct sunlight
Rarity & Value
Common, affordable, value depends on color saturation and transparency
Special Characteristics
Strong birefringence, often exhibits fluorescence under UV light
Lore & History
Associated with the solar plexus chakra, traditionally used for mental clarity, motivation, and positive energy