Thometzekite (w. gypsum)

TSNB487
Specimen
Grosch, K.
Exhibit 1. Thometzekite (w. gypsum); 80 mm.
Exhibit 1. Thometzekite (w. gypsum); 80 mm.
Image Credit: Mariusz Oleszczuk
Exhibit 2. 40 mm field of view.
Exhibit 2. 40 mm field of view.
Image Credit: Mariusz Oleszczuk
Thumbnail by 1Thumbnail by 2

Specimen Title

Thometzekite (w. gypsum)

Associated Minerals

gartrellite; gypsum

Principal Mineral

Thometzekite

Size

Cabinet; 80mm

Location in the Mine

Second oxidation zone (?)

Provenance

Grosch, K.

Collection

Oleszczuk, M.; TTZGYP01

Entry Number

Specimen; TSNB487

Associated Minerals

gartrellite; gypsum

Description

Large platy crystals of colourless, transparent gypsum, richly included and partly encrusted (Exhibit 2) by pale spearmint-green thometzekite and very sparse yellow-green gartrellite (the latter not discernible in these images). Both arsenate minerals are XRD-verified although their compositions have not been determined. The thometzekite appears to be concentrated in planar zones, possibly controlled by the cleavage in the gypsum (Exhibit 2).

The specimen was formerly in the Karlheinz Grosch Collection and, while the location in the mine is not recorded, it is probably from the second oxidation zone.