Image Credit: Bruce Cairncross
Image Credit: Bruce Cairncross
Image Credit: Bruce Cairncross
Specimen Title
Tsumcorite
Associated Minerals
goethite (?); quartz
Principal Mineral
Size
Cabinet; 78mm
Location in the Mine
Second oxidation zone (?)
Provenance
Thoni, H.
Collection
Cairncross, B.; 9293
Entry Number
Specimen; TSNB467
Associated Minerals
goethite (?); quartz
Description
A siliceous matrix, with well-formed quartz crystals (to 6 mm) on the display face, mostly flat-lying, and almost completely encrusted with chocolate-brown goethite (?). An extensive but incomplete crust of orange-yellow tsumcorite completes the paragenesis, providing a striking colour contrast against the underlying goethite. The tsumcorite comprises sheaves of acicular crystals (to circa 2 mm; exhibits 2 and 3).
The specimen was acquired froom Swiss collector Hans Thoni.
The location in the mine is not recorded but this is almost certainly a second oxidation zone specimen.
The tsumcorite has been XRD verified (Paul Carr; University of Wollongong, Australia; August 2024) but its chemical composition has not been determined.
