feinglosite (w. adamite and mimetite)

TSNB468

Specimen

Exhibit 1. Feinglosite (w. adamite and mimetite); 54 mm.
Exhibit 1. Feinglosite (w. adamite and mimetite); 54 mm.
Image Credit: Bruce Cairncross
Exhibit 2. Feinglosite (w. adamite and mimetite); 54 mm.
Exhibit 2. Feinglosite (w. adamite and mimetite); 54 mm.
Image Credit: Bruce Cairncross
Exhibit 3.
Exhibit 3.
Image Credit: Bruce Cairncross
Exhibit 4. Specimen label (Terry Seward).
Exhibit 4. Specimen label (Terry Seward).
Image Credit: Bruce Cairncross
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Title

feinglosite (w. adamite and mimetite)

Principal Mineral

Feinglosite

Size

Cabinet; 54mm

Location in the Mine

Second oxidation zone; 35 Level; North East Stope

Collection

Cairncross, B. 9507

Collected by

John Innes; February 1, 1980

Provenance

Innes, J.; Seward, T.M.

Entry Type

Specimen TSNB468

Description

A matrix of partly oxidised sulphide ore is richly encrusted with tabular crystals (to 4 mm) of translucent, sub-vitreous, off-white adamite, intergrown to form a domed coralloid mass (Exhibit 1) and lining vugs on the reverse of the specimen (Exhibit 2). A partial crust of chalky, cream-coloured feinglosite has formed on some of the adamite crystals, concentrated close to the boundary between the adamite and the sulphide matrix (Exhibits 3). Sparse crystals of colourless mimetite (to 2 mm) are also present on the adamite.

A considerable quantity of this material was collected from the North-East Stope on 35 Level, by TCL mineralogist John Innes, on 1 February 1980. Innes gifted several pieces to Terry Seward in July 1982 when Seward visited the Tsumeb mine; feinglosite (IMA1995-013) was not known at that time. Seward’s label (Exhibit 4) clearly post-dates the description of feinglosite (Clark et al. 1985) but all named species have been analytically verified.

The specimen was obtained in an exchange with Terry Seward.

Associated Minerals

adamite; mimetite