Chrysocolla in Matrix
Chrysocolla (IMA: Chrysocolla) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Orthorhombic (Microcrystalline/Amorphous); Habit: Typically botryoidal, massive, or as crusts and secondary coatings
Mineral Group
Silicates (Phyllosilicates)
Chemical Formula
(Cu,Al)2H2Si2O5(OH)4·nH2O (Hydrous copper silicate often containing impurities of aluminum and iron)
Formation Process
Secondary/Exogenous: Forms through the weathering and oxidation of copper-bearing minerals in hydrothermal or sedimentary environments
About This Crystal
Visible as vibrant cyan-blue to turquoise-green veins and crusts embedded within a brown/tan host rock (matrix). It exhibits a dull to sub-vitreous luster and is generally opaque to translucent in thin sections.
Physical Characteristics
Color: Cyan to Green; Streak: White to pale blue; Cleavage: None; Fracture: Conchoidal to uneven; Specific Gravity: 2.0-2.4; Fluorescence: Generally none
Optical Properties
Refractive Index: 1.50-1.60; Birefringence: Weak; Pleochroism: None; Optical Nature: Biaxial (-); Noted for its intense, pigment-like saturation
Hardness & Durability
Origin Region
Arizona (USA), Chile, Peru, and Congo; typically found in the oxidation zones of copper ore bodies
Hardness & Durability
Mohs Hardness: 2.5 to 4.0; Very brittle and soft. Often needs stabilization or an 'Agatized' form to be durable enough for jewelry
Care & Maintenance
Clean with warm soapy water only; avoid ultrasonics, steam cleaners, and harsh chemicals. Sensitive to acids and sudden temperature changes.
Rarity & Value
Common to uncommon; Value is determined by the intensity of the blue color and the aesthetic contrast with the matrix. Gem-grade 'Stellarite' is more valuable.
Special Characteristics
Often found intergrown with Quartz (Agatized Chrysler), Malachite, or Azurite; non-conductive; can be identified by its tendency to stick to the tongue due to high water content
Lore & History
Historically used as a 'stone of communication' and peace. Ancient Greeks used copper-based minerals like this for soldering gold. Associated with the Throat Chakra in traditional lore.