Minerals identify

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Duftite

Arsenate mineral

Duftite is a relatively common arsenate mineral with the formula CuPb(AsO4)(OH), related to conichalcite. It is green and often forms botryoidal aggregates. It is a member of the adelite Group, Conichalcite-Duftite Series. Duftite and conichalcite specimens from Tsumeb are commonly zoned in color and composition. Microprobe analyses and X-ray powder-diffraction studies indicate extensive substitution of Zn for Cu, and Ca for Pb in the duftite structure. This indicates a solid solution among conichalcite, CaCu(AsO4)(OH), austinite , CaZn(AsO4)(OH) and duftite PbCu(AsO4)(OH), all of them belonging to the adelite group of arsenates. It was named after Mining Councilor G Duft, Director of the Otavi Mine and Railroad Company, Tsumeb, Namibia. The type locality, Otjikoto Region, Namibia.

Identification

Color of mineral

Green
Grey

Mohs scale ( mineral hardness )

4.5

The streak

Green
White

Density ( specific gravity )

2.03
2.06
2.08

Luster ( interacts light )

Dull
Vitreous

Crystal ( diaphaneity )

Orthorhombic