Aurichalcite (w. hemimorphite and hydrozincite)

TSNB812
Specimen
Krantz, F.
Exhibit 1. Aurichalcite (w. hemimorphite and hydrozincite); 85 mm.
Exhibit 1. Aurichalcite (w. hemimorphite and hydrozincite); 85 mm.
Image Credit: Malcolm Southwood photo; courtesy of the NHM London.
Exhibit 2. 40 mm field of view.
Exhibit 2. 40 mm field of view.
Image Credit: Malcolm Southwood photo; courtesy of the NHM London.
Exhibit 3. Specimen label (Krantz, F.)
Exhibit 3. Specimen label (Krantz, F.)
Image Credit: Malcolm Southwood photo; courtesy of the NHM London
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Specimen Title

Aurichalcite (w. hemimorphite and hydrozincite)

Associated Minerals

hemimorphite; hydrozincite; malachite (?)

Principal Mineral

Aurichalcite

Size

Cabinet; 85mm

Location in the Mine

First oxidation zone

Provenance

Krantz, F.

Collection

NHM London; BM.1909,104

Entry Number

Specimen; TSNB812

Associated Minerals

hemimorphite; hydrozincite; malachite (?)

Description

A brecciated matrix of altered dolostone (?), cemented by chalky-white hydrozincite and, possibly, a little malachite (?). Two major vugs in the hydrozincite host feathery aggregates of acicular crystals of pale-blue aurichalcite (to 5 mm) and stacked aggregates of colourless, glassy, hemimorphite blades (Exhibit 2).

The specimen was purchased from Dr F. Krantz (of Bonn; Exhibit 3) in 1909 which dates it unequivocally to the upper part of the first oxidation zone (i.e. above 6 Level).