malachite (w. azurite, arsentsumebite and gartrellite (?))

TSNB762
Specimen
Klein, W.
Exhibit 1. Malachite (w. azurite, arsentsumebite and gartrellite (?)); 95 mm.
Exhibit 1. Malachite (w. azurite, arsentsumebite and gartrellite (?)); 95 mm.
Image Credit: Malcolm Southwood
Exhibit 2. 50 mm field of view.
Exhibit 2. 50 mm field of view.
Image Credit: Malcolm Southwood
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Specimen Title

malachite (w. azurite, arsentsumebite and gartrellite (?))

Associated Minerals

arsentsumebite; azurite; gartrellite (?)

Principal Mineral

Malachite

Size

Cabinet; 95mm

Location in the Mine

First oxidation zone; 6 Level

Provenance

Klein, W.

Collection

MGMH; 127340

Entry Number

Specimen; TSNB762

Description

A matrix consisting mainly of massive cryptocrystalline malachite, with subordinate azurite and a powdery yellow tsumcorite group mineral, probably gartrellite (?) (XRD indicated; Paul Carr, University of Wollongong, 2016). A flat vug on the display surface hosts intergrown, blocky pseudomorphs of malachite after azurite (to 3 mm) and fans of crystals (to 2 mm) of translucent green arsentsumebite (XRD indicated; Exhibit 2).


This was specimen 993 in the collection of Wilhelm Klein, production manager at Tsumeb between 1916 and 1939. His catalogue records that it is from 6 Level in the first oxidation zone.