Image Credit: Malcolm Southwood
Specimen Title
malachite after azurite (w. bayldonite and duftite)
Associated Minerals
arsentsumebite (?); bayldonite; conichalcite/duftite
Principal Mineral
Precursor Mineral
Size
Cabinet; 50mm
Location in the Mine
First oxidation zone; 4 Level
Provenance
Klein, W.
Collection
MGMH; 111608
Entry Number
Specimen; TSNB738
Description
An intergrowth of sharp, tabular azurite crystals has been completely replaced by malachite and is nested in a cavernous matrix largely comprising a cryptocrystalline mixture of bayldonite and duftite (XRD confirmed; Paul Carr, University of Wollongong 2016). Sub-mm crystals of a spearmint green mineral are provisionally identified as arsentsumbite (?).
This was specimen 478 in the collection of Wilhelm Klein, production manager at Tsumeb between 1916 and 1939. His catalogue records that it is from 4 Level in the first oxidation zone.
