Azurite
Azurite · Mineral Specimen and Collector Mineral
Crystal System
Monoclinic; often occurs as massive, nodular, or tabular crystalline crusts and botryoidal aggregates
Mineral Group
Carbonates; subclass anhydrous carbonates with hydroxyl
Chemical Formula
Cu3(CO3)2(OH)2
Formation Process
Hydrothermal and supergene alteration processes in the oxidation zones of copper deposits where carbonated water reacts with copper-bearing minerals
About This Crystal
The specimen exhibits a deep, vibrant royal blue coloration clustered in a vug or cavity within a host rock matrix, accompanied by subtle greenish tinges from associated secondary minerals like malachite. The luster ranges from vitreous to dull earthy, and the transparency is opaque.
Physical Characteristics
Deep azure blue body color with a lighter blue streak, crystal habit is massive to botryoidal/druzy in a cavity, perfect cleavage in one direction, conchoidal to uneven fracture, specific gravity of approximately 3.77 to 3.89, and brittle tenacity
Optical Properties
Biaxial positive with high birefringence, strong pleochroism in shades of blue, and refractive index ranging from 1.730 to 1.838
Hardness & Durability
Origin Region
Notable sources include Chessy-les-Mines near Lyon France, Tsumeb in Namibia, and Arizona in the United States; found in the oxidized zones of copper ore deposits
Hardness & Durability
Mohs hardness of 3.5 to 4, poor toughness due to brittleness and perfect cleavage, highly sensitive to heat, acids, and ammonia, not recommended for everyday jewelry wear
Care & Maintenance
Clean only with a soft dry cloth or very gentle lukewarm water, avoid ultrasonic or steam cleaners, avoid prolonged exposure to direct sunlight and high heat to prevent color fading or alteration to malachite
Rarity & Value
Uncommon to rare depending on crystal quality and formation size; valued by collectors for rich color saturation and crystalline perfection, with prices varying based on specimen size and aesthetic matrix association
Special Characteristics
Often naturally transitions or pseudomorphs into malachite over time due to weathering and hydration changes
Lore & History
Historically used as a blue pigment in paintings during antiquity and the Middle Ages known as mountain blue; associated in modern metaphysical lore with the third eye chakra, intuition, and mental clarity, though these are traditional beliefs and not scientific claims