Cu4SO4(OH)6·H2O
Locality:
Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
Field of view: 0.65 mm
Posnjakite or langite.
Photo: Michael Förch
Posnjakite is an uncommon but widespread secondary mineral in the oxidised zone of copper sulfide deposits, which may be of post-mine formation and may also occur in slag. This copper sulphate hydrate generally forms at low temperatures.
Very cool crystals. We have Chalcanthite at our store. A copper sulfate crystal also from copper mines. When My computer is back up and running I will post some pics.
Are you on Tumblr bro?
Not sure what Tumblr is. Not too computer savvy.