Duftite-beta Mineral Data

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General Duftite-beta 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. Duftite-beta (1956) is now considered a compositional intermediate in the duftite-conichalcite series

IMA Status:

Discredited IMA 2006

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.

Name Pronunciation:

Duftite-beta

Synonym:

Beta-duftite

Duftite-beta Image

Images:

Duftite-beta

Comments: Intensely green Duftite-beta on fluorescent calcite.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: .
© Fabre Minerals

Images:

Duftite-beta Jamesite

Comments: Reddish-brown bladed jamesite crystals overgrown with white dolomite and associated with dark green duftite.
Location: Tsumeb mine, Tsumeb, Otavi District, Oshikoto, Namibia. Scale: See Image.
© Rruff Database

Duftite-beta 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-beta

Color:

Green, Olive green, Grayish green.

Density:

6.4

Diaphaneity:

Translucent

Hardness:

3 - Calcite

Luster:

Vitreous - Dull

Optical Properties of Duftite-beta

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
Ncalc = 1.97 - 2

Optical Data:

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

Calculated Properties of Duftite-beta

Electron Density:

Bulk Density (Electron Density)=5.72 gm/cc
note: Specific Gravity of Duftite-beta =6.60 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Duftite-beta= 879.99 barns/electron
U=PE_Duftite-beta x rElectron Density=5,036.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Duftite-beta is Not Radioactive

Duftite-beta Classification

Dana Class:

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

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

(41.05.01)Adelite Group

41.05.01.01 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.02 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.03 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.04 Duftite-beta? PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.05 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

41.05.01.06 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.07 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.08 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.09 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

41.05.01.10 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

08.BH.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1

08.BH.35 Austinite CaZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Adelite CaMg(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Duftite-beta? PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Cobaltaustinite CaCo(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Conichalcite CaCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Gabrielsonite PbFe(AsO4)(OH) P 2₁m mm2

08.BH.35 Nickelaustinite Ca(Ni,Zn)(AsO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Tangeite CaCu(VO4)(OH) P 2₁2₁2₁ 2 2 2

08.BH.35 Gottlobite! CaMg(VO4,AsO4)(OH) P 2₁2₁2₁ 2 2 2

Other Duftite-beta Information

References:

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

See Also:

Links to other databases for Duftite-beta :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Ask about Duftite-beta here :
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Duftite-beta

PbCu(AsO4)(OH)
Dana No: 41.05.01.04 Strunz No: 08.BH.35
Locality:

Notes: