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Duftite

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Formula:
PbCu(AsO4)(OH)
System:
Orthorhombic
Colour:
Olive-green, grey-green; ...
Lustre:
Sub-Vitreous, Resinous, Waxy, Dull
Hardness:
Name:
Named by Otto Pufahl in 1920 for Gustav Bernhard Duft [b. 1859 Clausthal, Germany - 1924?], second General Manager of the Tsumcor Mine (Tsumeb Mine), Namibia (~1906), but Duft was active in Namibia as early as 1892. Guillemin (1956) distinguished two kinds of duftite: "duftite-α" = duftite (space group Pnam) and (Ca-bearing) "duftite-β" = duftite (space group P212121).

Classification of Duftite

Approved, 'Grandfathered' (first described prior to 1959)
8.BH.35

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1
41.5.1.4

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
20.5.3

20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb

Occurrences of Duftite

Type Occurrence of Duftite

Geological Setting of Type Material:
Oxidized zone of a polymetallic deposit.
Associated Minerals at Type Locality:

Physical Properties of Duftite

Sub-Vitreous, Resinous, Waxy, Dull
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Lustre vitreous on fracture surfaces; dull on crystal faces.
Colour:
Olive-green, grey-green; light apple-green in transmitted light.
Streak:
Pale green, white.
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Usually unobservable in botryoidal aggregates.
Fracture:
Conchoidal, Sub-Conchoidal
Density:
6.12 g/cm3 (Measured)    6.602 g/cm3 (Calculated)
Comment:
Duftite-α D=6.57

Crystallography of Duftite

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
Cell Parameters:
a = 7.749(1) Å, b = 9.36(1) Å, c = 5.91(1) Å
Ratio:
a:b:c = 0.828 : 1 : 0.631
Unit Cell Volume:
V 428.66 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Usually botryoidal, rare tiny crystals elongated [001] with curved and rough faces aggregated into crusts. Pseudo-octahedral.
Comment:
For P212121; UCD for Pnam a 7.788, b 9.223, c 6.001
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.18 (70)
3.17 (100)
2.91 (80)
2.63 (90)
2.26 (90)
1.868 (50)
1.750 (50)
1.637 (70)

Optical Data of Duftite

Type:
Biaxial (-)
RI values:
nα = 2.030 - 2.040 nβ = 2.060 - 2.080 nγ = 2.080 - 2.100
Birefringence:
0.055
Max Birefringence:
δ = 0.050 - 0.060
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v perceptible
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of Duftite

Formula:
PbCu(AsO4)(OH)
All elements listed in formula:

Relationship of Duftite to other Species

Series:
Forms a series with Conichalcite (see here)
Forms a series with Mottramite (see here)
Other Members of Group:
AdeliteCaMg(AsO4)(OH)
ArsendescloizitePbZn(AsO4)(OH)
AustiniteCaZn(AsO4)(OH)
ČechitePbFe2+(VO4)(OH)
CobaltaustiniteCaCo(AsO4)(OH)
ConichalciteCaCu(AsO4)(OH)
DescloizitePbZn(VO4)(OH)
GabrielsonitePbFe(AsO4)(OH)
GottlobiteCaMg(VO4,AsO4)(OH)
HermannroseiteCaCu(PO4)(OH)
MottramitePbCu(VO4)(OH)
NickelaustiniteCaNi(AsO4)(OH)
PyrobelonitePbMn2+(VO4)(OH)
TangeiteCaCu(VO4)(OH)
VuagnatiteCaAl(SiO4)(OH)
8.BH.05ThadeuiteCa(Mg,Fe2+)3(PO4)2(OH,F)2
8.BH.10DurangiteNaAl(AsO4)F
8.BH.10IsokiteCaMg(PO4)F
8.BH.10LacroixiteNaAl(PO4)F
8.BH.10MaxwelliteNaFe3+(AsO4)F
8.BH.10PanasqueiraiteCaMg(PO4)(OH,F)
8.BH.10TilasiteCaMg(AsO4)F
8.BH.15DrugmanitePb2(Fe3+,Al)(PO4)(PO3OH)(OH)2
8.BH.20Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3
8.BH.20CirroliteCa3Al2(PO4)3(OH)3 (?)
8.BH.20KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3
8.BH.20PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3
8.BH.20PerloffiteBa(Mn2+,Fe2+)2Fe23+(PO4)3(OH)3
8.BH.20JohntomaiteBaFe22+Fe23+(PO4)3(OH)3
8.BH.25Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4
8.BH.25Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4
8.BH.30CarminitePbFe23+(AsO4)2(OH)2
8.BH.30SewarditeCaFe23+(AsO4)2(OH)2
8.BH.35AdeliteCaMg(AsO4)(OH)
8.BH.35ArsendescloizitePbZn(AsO4)(OH)
8.BH.35AustiniteCaZn(AsO4)(OH)
8.BH.35CobaltaustiniteCaCo(AsO4)(OH)
8.BH.35ConichalciteCaCu(AsO4)(OH)
8.BH.35GabrielsonitePbFe(AsO4)(OH)
8.BH.35NickelaustiniteCaNi(AsO4)(OH)
8.BH.35TangeiteCaCu(VO4)(OH)
8.BH.35GottlobiteCaMg(VO4,AsO4)(OH)
8.BH.35HermannroseiteCaCu(PO4)(OH)
8.BH.40ČechitePbFe2+(VO4)(OH)
8.BH.40DescloizitePbZn(VO4)(OH)
8.BH.40MottramitePbCu(VO4)(OH)
8.BH.40PyrobelonitePbMn2+(VO4)(OH)
8.BH.45BayldonitePbCu3(AsO4)2(OH)2
8.BH.45VésigniéiteBaCu3(VO4)2(OH)2
8.BH.50PaganoiteNiBi(AsO4)O
8.BH.55JagoweriteBaAl2(PO4)2(OH)2
8.BH.60Attakolite(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4
8.BH.65LeningraditePbCu3(VO4)2Cl
20.5.1CafarsiteCa5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O
20.5.2SchultenitePb(HAsO4)
20.5.4BayldonitePbCu3(AsO4)2(OH)2
20.5.5PhilipsbornitePbAl3(AsO4)2(OH)5 · H2O
20.5.6ArsendescloizitePbZn(AsO4)(OH)
20.5.7HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
20.5.8ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
20.5.9Caryinite(Na,Pb)(Ca,Na)CaMn22+(AsO4)3
20.5.10LudlockitePbFe43+As103+O22
20.5.11GabrielsonitePbFe(AsO4)(OH)
20.5.12CarminitePbFe23+(AsO4)2(OH)2
20.5.13SegnititePbFe33+(AsO4)2(OH,H2O)6
20.5.14TsumcoritePbZn2(AsO4)2 · 2H2O
20.5.15JamesitePb2Zn(Fe2+,Zn)2Fe43+(AsO4)4(OH)10
20.5.16MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
20.5.17ArsenbrackenbuschitePb2Fe3+(AsO4)2(OH)

Other Names for Duftite

Name in Other Languages:

Other Information

Not Fluorescent in UV
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Duftite

Reference List:
Pufahl (1920) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 289.

Barth and Berman (1930) Chemie der Erde, Jena: 5: 30.

Strunz, H. (1939): Mineralien der Descloizitgruppe. Konichalcit, Staszizit, Austinit, Duftit, Aräoxen, Volborthit, Pyrobelonit. Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig (A) 101, 496-506.

Richmond (1940) American Mineralogist: 25: 458.

Claringbull, G.F. (1951) New occurrences of duftite. Mineralogical Magazine, 29, 609–614.

Guillemin, C. (1956) Contribution a la minéralogie des arséniates,
phosphates et vanadates de cuivre. I. Arséniates de cuivre. Bulletin de la Société française de Minéralogie, 79, 7–95, esp. 70–80 (in French).

American Mineralogist (1957): 42: 123.

Jambor, J.L., D.R. Owens, and J.E. Dutrizac (1980) Solid solution in the
adelite group of arsenates. Canadian Mineralogist, 18, 191–195.

Kharisun, M.R. Taylor, D.J.M. Bevan,
and A. Pring (1998) The crystal chemistry of duftite, PbCuAsO4(OH) and the beta-duftite problem. Mineralogical Magazine, 62, 121–130.

Internet Links for Duftite

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http://www.mindat.org/min-1325.html
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Specimens:
The following Duftite specimens are currently listed for sale on minfind.com.

Localities for Duftite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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