tsumebite (w. azurite and smithsonite)

TSNB424
Specimen
Von Karabacek, H.
Exhibit 1. Tsumebite (w. azurite and smithsonite); 93 mm.
Exhibit 1. Tsumebite (w. azurite and smithsonite); 93 mm.
Image Credit: Malcolm Southwood
Exhibit 2. 36 mm field of view.
Exhibit 2. 36 mm field of view.
Image Credit: Malcolm Southwood
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Specimen Title

tsumebite (w. azurite and smithsonite)

Associated Minerals

azurite; smithsonite

Principal Mineral

Tsumebite

Size

Cabinet; 93mm

Location in the Mine

First oxidation zone

Provenance

Von Karabacek, H.

Collection

MGMH; 101827

Entry Number

Specimen; TSNB424

Description

Blocky crystals (to 10 mm) of lustrous blue-black azurite, on a crust of off-white smithsonite over a dolostone breccia. Locally, the smithsonite is quite richly encrusted with pale sea-green microcrystals of tsumebite.

The specimen is from the Hans von Karabacek Collection, much of which was acquired by MGMH in 1935. The vintage of the specimen dates it unequivocally to the first oxidation zone. A handwritten note records that this specimen was the source of crystals studied by LaForge (1938) to confirm that tsumebite crystallises with monoclinic symmetry.