Idaite, Chalcopyrite, Covellite
Undu mine, Nukundamu, Vanua Levu, Fiji
The microstructure of Cu-Fe sulphides from Nukundamu.
Lamellar replacement of chalcopyrite (olive brown to dark blue anisotropy) by idaite (strong tourquoise, green to reddish brown anisotropy) and covellite (strong orange red anisotropy). Notably, large portions of the Cu-Fe sulphides show finely branched shrinkage cracks (black), providing ...
© Günter Grundmann, Detmold, Germany