Calcite (w. orientated duftite inclusions)

TSNB822
Specimen
Exhibit 1. Calcite (w. orientated conichalcite-duftite inclusions); 110 mm.
Exhibit 1. Calcite (w. orientated conichalcite-duftite inclusions); 110 mm.
Image Credit: Malcolm Southwood photo; courtesy of the Tsumeb Museum, Namibia
Exhibit 2. 90 mm field of view.
Exhibit 2. 90 mm field of view.
Image Credit: Malcolm Southwood photo; courtesy of the Tsumeb Museum, Namibia
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Specimen Title

Calcite (w. orientated duftite inclusions)

Associated Minerals

conichalcite-duftite

Principal Mineral

Calcite

Size

Cabinet; 110mm

Location in the Mine

Undetermined

Collection

Tsumeb Museum, Namibia

Entry Number

Specimen; TSNB822

Associated Minerals

conichalcite-duftite

Description

Colourless-white rhombohedral calcite crystals (to 30 mm) with inclusions of lime-green conichalcite-duftite. The arsenate microcrystals nucleated selectively on the edges and corners of an earlier phase of crystal development to form three-point "Mercedes stars". When calcite growth resumed, it did so with the same c-axis orientation but with the lattice rotated by 60 degrees.

The specimen is from a relatively small occurrence for which the location in the mine is undetermined.