mineral

Chrysocolla (on host rock)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Copper silicate)

Hardness: 2.5-3.5; Color: Cyan, blue-green, or turquoise; Luster: Vitreous to earthy; Crystal structure: Amorphous; Cleavage: None; Specific Gravity: 2.0-2.4

Hardness: 2
Color: Cyan, blue-green, or turquoise
Luster: Vitreous to earthy

Identified May 29, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 2.5-3.5; Color: Cyan, blue-green, or turquoise; Luster: Vitreous to earthy; Crystal structure: Amorphous; Cleavage: None; Specific Gravity: 2.0-2.4

Formation & geological history

Secondary mineral formed in the oxidation zones of copper ore bodies. It occurs as precipitates from copper-bearing solutions in fractures and cavities of igneous or metamorphic host rocks.

Uses & applications

Used primarily as a minor ore of copper, as ornamental stone for carvings, and in silver jewelry as a more affordable turquoise alternative.

Geological facts

Chrysocolla is often confused with turquoise but is generally softer. It is sometimes found infused with quartz (called Stellarite or Drusy Chrysocolla), which makes it hard enough for faceted jewelry.

Field identification & locations

Identify by its distinct bright blue-green streaks against a duller host rock. It is often found in arid regions like Arizona, Chile, and the Democratic Republic of Congo near copper mines.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic