Chrysocolla
Chrysocolla · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Orthorhombic / Monoclinic, typically found in massive, botryoidal, or encrusting habits
Mineral Group
Silicates, specifically phyllosilicates
Chemical Formula
(Cu,Al)2H2Si2O5(OH)4·nH2O
Formation Process
Supergene alteration and secondary mineral formation in the oxidation zones of copper-bearing mineral deposits, formed at low temperatures and pressures
About This Crystal
Small, tumbled, or water-worn pebble exhibiting vibrant bluish-green to turquoise coloration with minor mottling and a sub-vitreous to waxy luster, displaying a translucent to opaque character
Physical Characteristics
Color ranges from cyan, turquoise blue to bright green; streak is pale green or white; cleavage is none distinct; fracture is conchoidal to uneven; specific gravity is approximately 2.0 to 2.4; tenacity is brittle
Optical Properties
Biaxial (-) with refractive indices around 1.570 to 1.635, displaying weak to moderate pleochroism in shades of blue and green, generally non-fluorescent or weakly fluorescent
Hardness & Durability
Origin Region
Found worldwide with notable deposits in the USA (Arizona), Chile, Peru, Democratic Republic of Congo, and Russia; typically forms in the oxidized zones of copper ore bodies
Hardness & Durability
Mohs hardness of 2.5 to 3.5, making it relatively soft and fragile; poor toughness; highly sensitive to acids and prolonged exposure to water or harsh chemicals; requires careful handling for jewelry use
Care & Maintenance
Clean gently with a soft cloth and mild soapy water; avoid ultrasonic cleaners, steam, abrasive materials, and prolonged exposure to direct sunlight or harsh chemicals
Rarity & Value
Common to uncommon as a mineral specimen, though high-grade gem-quality material with vivid color is more valued; widely available in tumbled and polished forms at affordable prices
Special Characteristics
Often found intergrown with quartz, chalcedony, or malachite, creating striking multicolored patterns and increasing its durability
Lore & History
Historically used by ancient civilizations like the Egyptians and Greeks as a soothing stone and for ornamental purposes; in modern crystal lore, it is associated with communication, tranquility, and the throat chakra, though these are traditional beliefs