Chrysocolla

Chrysocolla


Composition: Cu2-xAlx(H2-xSi2O5)(OH)4 ยท nH2O (x < 1)
Crystal System : Orthorhombic
Colours: Green, bluish green, blue, blackish blue, or brown
Lustre : Vitreous, waxy, earthy
Hardness (H) : 2.5-3.5
Specific Gravity (S.G) : 1.93-2.40

 

Distribution

Very rare. First oxidation zone.

Occurrence

  • Supergene
  • 1st Oxidation Zone

Paragenetic and General Notes

Chrysocolla occurs as "bright green to sky-blue masses and crusts" (Pinch and Wilson, 1977). 

Gebhard (1999) notes that chrysocolla is found "sparingly throughout the deposit".

Chrysocolla is reported to form pseudomorphs after the following minerals:  azurite (rare).