Arsenbrackebuschite Mineral Data

General Arsenbrackebuschite Information

Chemical Formula:

Pb2(Fe++,Zn)(AsO4)2•(H2O)

Composition:

Molecular Weight = 768.49 gm

Zinc 2.13 % Zn 2.65 % ZnO

Iron 5.45 % Fe 7.01 % FeO

Arsenic 19.50 % As 29.91 % As₂O₅

Hydrogen 0.26 % H 2.34 % H₂O

Lead 53.92 % Pb 58.09 % PbO

Oxygen 18.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂Fe²⁺_0.75Zn_0.25(AsO₄)₂•(H₂O)

Environment:

Occurs in fissures in solomite breccia in the oxidized zone of a dolostone-hosted hydrothermal polymetallic ore deposit (Tsumeb, Namibia); in a hydrothermal polymetallic barite-fluo rite deposit (Clara-mine, Germany).

IMA Status:

Approved IMA 1978

Locality:

From Tsumeb, Namibia. In the Clara mine, near Oberwolfach, Black Forest, Germany. From Brixlegg, Tirol, Austria. At the Hornet mine, Hachita, Grant Co., New Mexico, USA. Link to MinDat.org Location Data.

Name Origin:

As the arsenate analog of "brackebuschite."

Name Pronunciation:

Arsenbrackebuschite + Pronunciation

Synonym:

ICSD 100411

PDF 29-1428

Arsenbrackebuschite Image

Images:

Arsenbrackebuschite

Comments: Brownish yellow arsenbrakenbuschite crystals on matrix.
Location: Tsumeb, Namibia.. Scale: Not Given.
© William Pinch

Arsenbrackebuschite Crystallography

Axial Ratios:

a:b:c =1.2843:1:1.4924

Cell Dimensions:

a = 7.764, b = 6.045, c = 9.022, Z = 2; beta = 112.5° V = 391.20 Den(Calc)= 6.52

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3(1), 3.27(1), 2.78(0.9),

Physical Properties of Arsenbrackebuschite

Cleavage:

{010} Perfect

Color:

Honey yellow.

Density:

6.54

Diaphaneity:

Transparent to Translucent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Adamantine - Resinous

Streak:

brownish yellow

Optical Properties of Arsenbrackebuschite

Gladstone-Dale:

CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1534,KPDmeas= 0.1529,KC= 0.151
Ncalc = 1.98 - 1.99

Optical Data:

Biaxial (-), b=2

Calculated Properties of Arsenbrackebuschite

Electron Density:

Bulk Density (Electron Density)=5.63 gm/cc
note: Specific Gravity of Arsenbrackebuschite =6.54 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_{Arsenbrackebuschite}= 978.62 barns/electron
U=PE_{Arsenbrackebuschite} x rElectron Density=5,513.31 barns/cc.

Radioactivity:

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

Arsenbrackebuschite Classification

Dana Class:

40.02.08.02 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) ï¿½ x(H2O)

(40.02.08)Brackebushite Group

40.02.08.01 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

40.02.08.02 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 2₁/m 2/m

40.02.08.03 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 2₁,P 2₁/m Mono

40.02.08.04 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

40.02.08.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

Strunz Class:

08.BG.05 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1

08.BG.05 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 2₁/m 2/m

08.BG.05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

08.BG.05 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

08.BG.05 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 2₁,P 2₁/m Mono

08.BG.05 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

08.BG.05 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

08.BG.05 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

08.BG.05 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

08.BG.05 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

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

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Arsenbrackebuschite

Pb2(Fe++,Zn)(AsO4)2•(H2O)
Dana No: 40.02.08.02 Strunz No: 08.BG.05
Locality:

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