Mimetite (w. malachite and copper)

TSNB635
Specimen
Gramatski, F.Johnson, M.L.
Exhibit 1. Mimetite with malachite and copper; 175 mm.
Exhibit 1. Mimetite with malachite and copper; 175 mm.
Image Credit: Malcolm Southwood
Exhibit 2. 40 mm field of view.
Exhibit 2. 40 mm field of view.
Image Credit: Malcolm Southwood
Exhibit 3. Specimen label (Mary Johnson)
Exhibit 3. Specimen label (Mary Johnson)
Image Credit: Malcolm Southwood
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Specimen Title

Mimetite (w. malachite and copper)

Associated Minerals

copper; malachite

Principal Mineral

Mimetite

Size

Cabinet; 175mm

Location in the Mine

Undetermined

Provenance

Gramatski, F.; Johnson, M.L.

Collection

MGMH; 2019.3.845

Entry Number

Specimen; TSNB635

Associated Minerals

copper; malachite

Description

A gossanous matrix, somewhat cavernous and friable, locally encrusted with radiating aggregates of fine, colourless-white acicular mimetite crystals (to 2 mm). The mimetite crust is punctuated by aggregates (to 8 mm) of native copper which are partly altered to malachite and encrusted with tiny malachite spherules (Exhibit 2).


The specimen was number 845 in the collection of Dr Mary L. Johnson (Exhibit 3) and belonged previously to Fritz Gramatski. The location in the mine is not recorded.