Duftite

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Duftite
2V angle
Large
Dispersionr > v, perceptible
SolubilityReadily soluble in acids[2]
Other characteristicsDecrepitates on heating. Not radioactive.
References[3][4][5]

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.[6] It was named after Mining Councilor G Duft, Director of the Otavi Mine and Railroad Company, Tsumeb, Namibia.[2] The type locality is the Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia.

Structure

The structure[7] 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.

Environment

Duftite is an uncommon product of weathered

pseudomorphs of duftite after mimetite have also found.[8] It occurs in association with olivenite, mottramite, azurite, malachite, wulfenite and calcite in the Tsumeb, Namibia deposit. It occurs with bayldonite, beudantite, mimetite and cerussite in the Cap Garonne mine, France.[5]

Duftite on cerussite, Tsumeb mine, Namibia (size: 6 × 5 × 3 cm)

Distribution

Reported from Argentina, Australia, Austria, Chile, the Czech Republic, France, Germany, Greece, Italy, Japan, Mexico, Namibia, Poland, Portugal, Russia, South Africa, Spain, Switzerland, the UK, the US and Zimbabwe.[4]

References

  1. S2CID 235729616
    .
  2. ^ a b c Wherry ET, Foshag WF (1921). "New mineral names" (PDF). American Mineralogist. 6: 140–141.
  3. ^ Duftite. Webmineral.com. Retrieved on 2011-10-10.
  4. ^ a b Duftite. Mindat.org
  5. ^ a b Duftite. (PDF) Handbook of Mineralogy
  6. ^ Jambor, J L, Owens, D R and Dutrizac, J E (1980). "Solid solution in the adelite group of arsenates" (PDF). Canadian Mineralogist. 18: 191–195.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  7. S2CID 98680784
    .
  8. ^ Australian Journal of Mineralogy. 11 (2): 79. {{cite journal}}: Missing or empty |title= (help)

Bibliography

  • Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 810-811.
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