duftite
Sign in to saveDuftite 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-descloizite 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
Key facts
- Mineral.name
- Duftite
- Mineral.category
- Arsenate minerals
- Mineral.image
- Anglesite-Duftite-174037.jpg
- Mineral.caption
- Duftite from Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia
- Mineral.formula
- PbCuAsO4(OH)
- Mineral.IMAsymbol
- Dft
- Mineral.molweight
- 426.67 g/mol
- Mineral.strunz
- 8.BH.35
- Mineral.dana
- 41.5.1.4
- Mineral.system
- Orthorhombic
- Mineral.class
- Disphenoidal (222) H-M symbol: (2 2 2)
- Mineral.symmetry
- P212121
- Mineral.unit cell
- a = 7.768(1), b = 9.211(1) c = 5.999(1) [Å]; Z = 4
- Mineral.color
- Green, olive green or grey green. Generally zoned due to compositional variations.
- Mineral.habit
- Tiny crystals elongated along [001] with curved and rough faces, aggregated into crusts. Crystals may be pseudo-octahedral.
- Mineral.cleavage
- Indistinct
- Mineral.fracture
- Uneven to conchoidal
- Mineral.mohs
- 4.5
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Encyclopedic overview
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- Structure
- Environment
- Distribution
- References
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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-descloizite 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 is the Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia.
==Structure== The structure is composed of chains of edge-sharing CuO6 distorted octahedra parallel to the c axis. The chains are linked by AsO4 tetrahedra and Pb atoms.
Excerpted from Wikipedia’s “duftite” article, available under the CC BY-SA 4.0 licence.