Arsenbrackebuschite Mineral Data

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."

Synonym:

ICSD 100411

PDF 29-1428

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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 - PrismaticH-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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Hofmeister W , Tillmanns E , Tschermaks Mineralogische und Petrographische Mitteilungen , 25 (1978) p.153-163, Strukturelle untersuchungen an arsenbrackebuschit

Physical Properties of Arsenbrackebuschite

Cleavage:

[010] Perfect

Color:

Honey yellow.

Density:

6.54

Diaphaniety:

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

Optical Data:

Biaxial (-), b=2

Calculated Properties of Arsenbrackebuschite

Electron Density:

r_electron=5.63 gm/cc
note: r_{Arsenbrackebuschite}=6.54 gm/cc.

Fermion Index

Fermion Index = 0.12129
Boson Index = 0.87871

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Arsenbrackebuschite is Not Radioactive

Arsenbrackebuschite Classification

Dana Class:

40.2.8.2 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.8)Brackebushite Group

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

40.2.8.2 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

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

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

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

Strunz Class:

VII/B.24-40 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.24 - Brackebuschite - Tsumebite group, Bearthite - Jamesite series

VII/B.24-05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-10 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-20 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-22 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

VII/B.24-25 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

VII/B.24-28 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

VII/B.24-30 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-40 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

VII/B.24-45 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2·(H2O) P 2₁,P 2₁/m Mono

VII/B.24-50 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-60 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-65 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

VII/B.24-70 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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

Arsenbrackebuschite

Pb2(Fe++,Zn)(AsO4)2·(H2O)
Dana No: 40.2.8.2 Strunz No: VII/B.24-40
Locality:

Notes: