Arsendescloizite Mineral Data

Arsendescloizite Mineral Data +

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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."

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

Diaphaniety:

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

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:

r_electron=5.70 gm/cc
note: r_{Arsendescloizite}=6.57 gm/cc.

Fermion Index

Fermion Index = 0.1132
Boson Index = 0.8868

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Arsendescloizite is Not Radioactive

Arsendescloizite Classification

Dana Class:

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

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

(41.5.1)Dana Group

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

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

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

41.5.1.4 Duftite-beta PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

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

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

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

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

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

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

Strunz Class:

VII/B.27-10 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.27 - Descloizite group

VII/B.27-10 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.27-20 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

VII/B.27-30 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

VII/B.27-40 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

VII/B.27-50 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Arsendescloizite

PbZn(AsO4)(OH)
Dana No: 41.5.1.9 Strunz No: VII/B.27-10
Locality:

Notes: