Arsendescloizite Mineral Data

General Arsendescloizite Information

Chemical Formula:

PbZn(AsO4)(OH)

Composition:

Molecular Weight = 428.52 gm

Zinc 15.26 % Zn 18.99 % ZnO

Arsenic 17.48 % As 26.82 % As₂O₅

Hydrogen 0.24 % H 2.10 % H₂O

Lead 48.35 % Pb 52.09 % PbO

Oxygen 18.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbZn(AsO₄)(OH)

Environment:

Occurs as a secondary mineral in oxidized hydrothermal polymetallic deposits.

IMA Status:

Approved IMA 1982

Locality:

From Tsumeb, Namibia. In the Gejiu Pb-Zn deposit, not otherwise located, China. From the Toroku mine, Miyazaki Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

As the arsenate analog of "descloizite."

Name Pronunciation:

Arsendescloizite + Pronunciation

Arsendescloizite Image

Images:

Arsendescloizite

Comments: Spherical aggregates of arsendescloizite crystals.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Arsendescloizite Crystallography

Axial Ratios:

a:b:c =0.6491:1:0.8157

Cell Dimensions:

a = 6.075, b = 9.358, c = 7.634, Z = 4; V = 433.99 Den(Calc)= 6.56

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): 2.88(1), 3.23(1), 2.6(0.8),

Crystal Structure:

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Keller P , Lissner F , Schleid T , Neues Jahrbuch fur Mineralogie, Monatshefte , 2003 (2003) p.374-384, The crystal structure of arsendescloizite, PbZn(OH)[AsO4], from Tsumeb (Namibia), Locality: Tsumeb, Namibia

Physical Properties of Arsendescloizite

Cleavage:

None

Color:

Light yellow, Dark green.

Density:

6.57

Diaphaneity:

Transparent

Hardness:

4 - Fluorite

Luster:

Subadamantine

Streak:

white

Optical Properties of Arsendescloizite

Gladstone-Dale:

CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1552,KPDmeas= 0.155,KC= 0.1499
Ncalc = 1.98

Optical Data:

Biaxial (-), a=1.99, b=2.03, g=2.035, bire=0.0450, 2V(Calc)=38, 2V(Meas)=30.

Calculated Properties of Arsendescloizite

Electron Density:

Bulk Density (Electron Density)=5.70 gm/cc
note: Specific Gravity of Arsendescloizite =6.57 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

PE_{Arsendescloizite}= 876.47 barns/electron
U=PE_{Arsendescloizite} x rElectron Density=4,998.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arsendescloizite is Not Radioactive

Arsendescloizite Classification

Dana Class:

41.05.01.09 (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 Arsendescloizite 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 Arsendescloizite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Arsendescloizite Specimen Label here :

Arsendescloizite

PbZn(AsO4)(OH)
Dana No: 41.05.01.09 Strunz No: 08.BH.35
Locality:

Notes: