Betpakdalite-CaCa

TSNB640
Specimen
Innes, J.Pinch, W.W.
Exhibit 1. Betpakdalite-CaCa; 57 mm.
Exhibit 1. Betpakdalite-CaCa; 57 mm.
Image Credit: Malcolm Southwood
Exhibit 2. 27 mm field of view.
Exhibit 2. 27 mm field of view.
Image Credit: Malcolm Southwood
Exhibit 3. Specimen label (W.W. Pinch).
Exhibit 3. Specimen label (W.W. Pinch).
Image Credit: MGMH Archive
Exhibit 4. Specimen label (J. Innes).
Exhibit 4. Specimen label (J. Innes).
Image Credit: MGMH Archive
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Specimen Title

Betpakdalite-CaCa

Associated Minerals

scorodite

Principal Mineral

Betpakdalite-CaCa

Size

Cabinet; 57mm

Location in the Mine

Second oxidation zone; 30 Level; West 20 South

Provenance

Innes, J.; Pinch, W.W.

Collection

MGMH; 2020.7.702

Collected by

John Innes; 13 May 1983

Entry Number

Specimen; TSNB640

Description

A rich crust of mustard-yellow betpakdalite-CaCa associated with minor pale-green scorodite on a matrix of oxidising chalcocite ore with a little quartz. Superficially the betpadalite-CaCa has a dull lustre with no obvious crystallinity; a closer view reveals a crust of tightly intergrown subhedral microcrystals with a waxy lustre (Exhibit 2).


The specimen is from the Bill Pinch Collection (Exhibit 3). It belonged formerly to TCL mineralogist John Innes and is accompanied by his original handwritten label (Exhibit 4) which indicates that he collected in on May 13, 1983, from the West 20 Stope on 30 Level in the second oxidation zone.
The specimen was studied by Kampf et al. (2012) in their study of the heteropolymolybdate family of minerals.