Wulfenite Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb , Otjikoto (Oshikoto) Region, Namibia Size : 8x7x3.5 cm. — Photo: Didier Descouens · CC BY-SA 4.0
Duftite
A green lead-copper arsenate forming botryoidal crusts in oxidized deposits — the lead-bearing partner of conichalcite.
Intro adapted from Wikipedia (CC BY-SA).
Duftite is an IMA-recognized mineral species in the arsenate class, with the chemical formula PbCu(AsO₄)(OH).
It crystallizes in the orthorhombic crystal system (space group P2_12_12_1). It is a member of the Adelite structural group.
Key properties: Mohs hardness 4.5; specific gravity 6.4; Pale green to white streak; Dull to vitreous on fractures luster; refractive index 2.065; optically biaxial.
IMA symbol Dft, grandfathered status — known before the IMA’s founding, named in 1920.
Occurs as an uncommon mineral in the oxidized zone of some hydrothermal base-metal deposits.
It is found associated with Olivenite, mottramite, azurite, malachite, wulfenite, calcite (Tsumeb, Namibia); bayldonite, beudantite, mimetite, cerussite (Cap Garonne mine, France).
In honor of G. Duft, General Manager of the mine at Tsumeb, Namibia.