Serpierite


Composition: Ca(Cu,Zn)4(SO4)2(OH)6.3H2O
Crystal System : Monoclinic
Colours: Very pale-blue, sky-blue
Lustre : Vitreous, pearly
Hardness (H) : 3.5-4.0
Specific Gravity (S.G) : 3.07
References: Keller (1984)

Distribution

Common. Probably in all three oxidation zones (?)

Occurrence

  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Paragenetic and General Notes

Somewhat inconspicuous, serpierite occurs as tiny white, whitish-blue, or blue-green scaly crystals associated with other sulphate minerals on oxidising surfaces of sulphide minerals.

Gebhard (1999) particularly highlights the association of serpierite with devilline on the surface of pseudomorphs of tennantite after enargite.

Serpierite is reported to form pseudomorphs after the following minerals:  tennantite (rare).