Fornacite
Moctezuma Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico
Typical, well crystallised crystals of Fornacite on what looks like to be Chrysocolla, accompanied by--but not on the photograph--Paratellurite and Cerrussite.
Specimen acquired from Helmuth Braith who found the material himself, Co-author of the following article:
Braith, H., Gröbner, J., Langer, G., and Seitz, M. (2001) Moctezumas geheime ...
© Andreas Schloth