Two highlights were botryoidal malachite from Schwaz, Tyrol, Austria, generously coating a 5 X 7-cm matrix, and metatorbernite
crystals to 1 cm on a 4 X 5-cm matrix from the antique locality of Slavkov (German name: Schlaggenwald), Bohemia, Czech Republic.
Torbernite and its slightly dehydrated equivalent, metatorbernite
, reach their finest development at the famous Musonoi uranium mine in the Congo.
Later, Zolensky (1985), using microprobe analysis, re-identified a specimen at Bryn Mawr College as sincosite, which had originally been identified as metatorbernite
from the Black Hills.
Not "new" anymore but still pretty thrilling is the renascence of superfine metatorbernite
from the Margabal mine, Aveyron, France - see my last Denver report (vol.
This is probably from the Castle Dome copper mine near Inspiration, where metatorbernite
has been reported (Petersen, 1947).
Primary Copper Minerals Secondary Copper Minerals Bornite Tenorite Antlerite Devilline Chalcopyrite Tetrahedrite Aurichalcite Langite Chalcocite Azurite Malachite Covellite Brochantite Metatorbernite
Cuprite Calciovolborthite Metazeunerite Digenite Chalcanthite Olivenite Djurleite Chalcoalumite Parnauite Enargite Chrysocolla Vesignieite Lautite Conichalcite Volborthite Tennantite Cyanotrichite Zeunerite
Some specimens of torbernite that have been removed from the mine and exposed to the dry Nevada climate have lost their clarity and deep green color rather quickly, as well as some molecular water, thus becoming metatorbernite.
Similar to the alteration of torbernite to metatorbernite, specimens of bright yellow tyuyamunite may change over time, loosing some molecular water and becoming a dull yellow-brown metatyuyamunite.
Gilbert Gauthier showcased about a half dozen of the gorgeous, deep blackish-green metatorbernite
specimens which have come for several decades from the Musonoi mines in Shaba, Zaire.