Chrysocolla

(Cu,Al)2H2Si2O5(OH)4 · nH2O

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Recognizable by its brilliant blue to green tones, chrysocolla is a hydrated copper phyllosilicate with the approximate formula (Cu,Al)2H2Si2O5(OH)4 nH2O. It forms in the oxidation zones of copper deposits, commonly associated with malachite, azurite, and turquoise. The mineral is translucent with a vitreous luster and a white to pale-blue streak, showing no cleavage and a conchoidal fracture. Habits are botryoidal, massive, or stalactitic. Its hardness varies considerably, from 2 to 4, and its specific gravity from 1.93 to 2.40. Chrysocolla is worked as an ornamental stone, valued for the vivid turquoise-like coloration it draws from copper. Both its density and its hardness vary widely, reflecting a variable water content and frequent admixture with other minerals.

Chrysocolla is a hydrated copper phyllosilicate mineral known for its brilliant blue to green colors. It is commonly found in oxidation zones of copper deposits, often associated with malachite, azurite, and turquoise.

Crystal System Orthorhombic
Mineral Class 09 Silicates
Mohs Hardness 2.0-4.0
Specific Gravity 1.93-2.40
Color Blue, blue-green, green, turquoise
Luster Vitreous
Streak White to pale blue
Cleavage None
Fracture Conchoidal
Transparency Translucent
Crystal Habit Botryoidal, massive, stalactitic

Mohs Hardness

Mohs Hardness: 2.0 – 4.0
1 Soft10 Hard
Chrysocolla has a Mohs hardness of 2–4 on the 1–10 mineral hardness scale.
Mohs Hardness Reference Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

Orthorhombic
Chrysocolla crystallizes in the Orthorhombic crystal system.
Property Value
Crystal System Orthorhombic
Axial Relationships a ≠ b ≠ c, α = β = γ = 90°

Frequently Asked Questions

What is the hardness of Chrysocolla?
Chrysocolla has a Mohs hardness of 2.0-4.0.
What crystal system does Chrysocolla belong to?
Chrysocolla crystallizes in the Orthorhombic crystal system.
What color is Chrysocolla?
Chrysocolla is typically Blue, blue-green, green, turquoise.
What type of luster does Chrysocolla have?
Chrysocolla exhibits a Vitreous luster.
What is the chemical formula of Chrysocolla?
The chemical formula of Chrysocolla is (Cu,Al)2H2Si2O5(OH)4 · nH2O.