Duftite-alpha Mineral Data

Duftite-alpha Mineral Data +

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General Duftite-alpha Information

Chemical Formula:

PbCu(AsO4)(OH)

Composition:

Molecular Weight = 426.67 gm

Copper 14.89 % Cu 18.64 % CuO

Arsenic 17.56 % As 26.93 % As₂O₅

Hydrogen 0.24 % H 2.11 % H₂O

Lead 48.56 % Pb 52.31 % PbO

Oxygen 18.75 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbCu(AsO₄)(OH)

Environment:

Secondary mineral in the oxidized zone of hydrothermal base metal deposits.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Tsumeb, Namibia Link to MinDat.org Location Data.

Name Origin:

Named in 1920 for G. Duft, general manager of the mine at Tsumeb, Namibia.

Duftite-alpha Image

Images:

Click Here for Larger Duftite-alpha Image

Duftite-alpha Mimetite

Comments: Mimetite crystals are replaced by Duftite-alpha on a gossanous matrix.
Location: Mt. Bonnie Mine, Northern Territory, Australia. Scale: Crystal size to 3mm.
© John Veevaert

Duftite-alpha Crystallography

Axial Ratios:

a:b:c =0.8433:1:0.6512

Cell Dimensions:

a = 7.768, b = 9.211, c = 5.999, Z = 4; V = 429.23 Den(Calc)= 6.60

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.26(1), 2.65(0.8), 2.85(0.8),

Physical Properties of Duftite-alpha

Color:

Green, Olive green, Grayish green.

Density:

6.4

Diaphaniety:

Translucent

Hardness:

3 - Calcite

Luster:

Vitreous - Dull

Optical Properties of Duftite-alpha

Gladstone-Dale:

CI meas= -0.103 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1626,KPDmeas= 0.1677,KC= 0.1521

Optical Data:

Biaxial (-), a=2.04, b=2.08, g=2.1, bire=0.0600

Calculated Properties of Duftite-alpha

Electron Density:

r_electron=5.72 gm/cc
note: r_{Duftite-alpha}=6.60 gm/cc.

Fermion Index

Fermion Index = 0.10741
Boson Index = 0.89259

Photoelectric:

PE_{Duftite-alpha}= 879.99 barns/electron
U=PE_{Duftite-alpha} x r_electron=5,036.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Duftite-alpha is Not Radioactive

Duftite-alpha Classification

Dana Class:

41.5.2.5 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.2)Dana Group

41.5.2.1 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.2 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.3 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.4 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.5 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/B.26-80 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.26 - Adelite - Duftite group

VII/B.26-10 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-15 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-20 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-30 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-40 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-50 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-60 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-70 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

VII/B.26-80 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.26-80* Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Duftite-alpha Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Duftite-alpha :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Duftite-alpha Specimen Label here :

Duftite-alpha

PbCu(AsO4)(OH)
Dana No: 41.5.2.5 Strunz No: VII/B.26-80
Locality:

Notes: