Bayldonite (w. gartrellite)

TSNB895
Specimen
Pieters, S.
Exhibit 1. Bayldonite (w. gartrellite); 105 mm.
Exhibit 1. Bayldonite (w. gartrellite); 105 mm.
Image Credit: Frank Höhle
Exhibit 2. 45 mm field of view.
Exhibit 2. 45 mm field of view.
Image Credit: Frank Höhle
Exhibit 3. Analytical data; gartrellite.
Exhibit 3. Analytical data; gartrellite.
Image Credit: Dr Ludger Krahn
Thumbnail by 1Thumbnail by 2Thumbnail by 3

Specimen Title

Bayldonite (w. gartrellite)

Associated Minerals

gartrellite; malachite; quartz; wulfenite

Principal Mineral

Bayldonite

Size

Cabinet; 105mm

Location in the Mine

Second oxidation zone; 29 Level; West 96 undercut stope; number 2 sub-level

Provenance

Pieters, S.

Collection

Krahn, L; Ts-166

Entry Number

Specimen; TSNB895

Description

Platy translucent crystals (to 1.5 mm) of dark-green bayldonite (XRD confirmed), with minor malachite and wulfenite and abundant greenish-yellow gartrellite (XRD and EPMA verified) on a matrix of iron-stained dolostone with minor quartz. The gartrellite occurs as crusts of minutely botryoidal micro crystals; EPMA analysis (Exhibit 3) shows that it is Zn-bearing. The wullfenite (inconspicuous in exhibits 1 and 2) occurs as colourless tabular crystals (to 3 mm).

The specimen was acquired by Dr Ludger Krahn from Namibian dealer Sid Pieters in February 1981. Both Pieters and Clive Queit were offering this material at that time with specimens attributed to the West 96 undercut stope, on number 2 sub-level, 29 Level, in the second oxidation zone.

XRD verification of the bayldonite was by Dr Oleg von Knorring (Leeds University, U.K., 1980); XRD and EPMA analysis of gartrellite (Exhibit 3) by Dr Werner Krause (Hürth, Germany, 2003).