Brackebuschite Mineral Data

General Brackebuschite Information

Chemical Formula:

Pb2(Mn,Fe++)(VO4)2(OH)

Composition:

Molecular Weight = 712.70 gm

Manganese 3.85 % Mn 5.54 % Mn₂O₃

Vanadium 14.30 % V 25.52 % V₂O₅

Zinc 0.92 % Zn 1.14 % ZnO

Iron 3.92 % Fe 5.60 % Fe₂O₃

Hydrogen 0.23 % H 2.02 % H₂O

Lead 55.24 % Pb 59.50 % PbO

Oxygen 21.55 % O

______ ______

100.00 % 99.33 % = TOTAL OXIDE

Empirical Formula:

Pb_1.9Mn³⁺_0.5Fe³⁺_0.5Zn_0.1(VO₄)₂1.6(OH)

Environment:

Secondary mineral in the oxidized zone of hydrothermal Pb-Zn deposits.

IMA Status:

Valid Species (Pre-IMA) 1880

Locality:

Venus, Agua del Rubio, Benvenida, Pilar, and Algarrobites mines, El Guaico District, Sierra de Cordoba, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for Ludwig Brackebusch (1849-1906), Professor of Mineralogy, University of Cordoba, Cordove, Argentina.

Name Pronunciation:

Brackebuschite + Pronunciation

Synonym:

ICSD 76869

PDF 29-1428

Brackebuschite Image

Images:

Krettnichite Brackebuschite

Comments: Scanning electron microscope image of a prismatic krettnichite (kr) aggregate associated with manganite (ma) and barian brackebuschite (br) in a vug. The inset is a close-up illustrating the morphology of brackebuschite. (Eur. J. Mineral, 13:146).
Location: hydrothermal manganite-quartz vein at the historic manganese deposit of Krettnich, Saarland, Germany. Scale: See Image.
© Eur. J. Mineral

Brackebuschite Crystallography

Axial Ratios:

a:b:c =1.4427:1:1.2479

Cell Dimensions:

a = 8.88, b = 6.155, c = 7.681, Z = 2; beta = 111° V = 391.93 Den(Calc)= 6.04

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): 3.25(1), 2.76(0.8), 4.95(0.8),

Physical Properties of Brackebuschite

Color:

Dark brown, Black.

Density:

6.05

Diaphaneity:

Translucent to Opaque

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Wedge shaped - Crystals shaped like a wedge.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Sub Metallic

Streak:

yellow

Optical Properties of Brackebuschite

Gladstone-Dale:

CI meas= -0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2282,KPDmeas= 0.2278,KC= 0.2089
Ncalc = 2.26

Optical Data:

Biaxial (+), a=2.28, b=2.36-2.38, g=2.48-2.49, bire=0.2000-0.2100, 2V(Calc)=82-88, 2V(Meas)=~90. Dispersion r > v strong.

Pleochroism (x):

nearly colorless.

Pleochroism (y):

dark reddish brown.

Pleochroism (z):

reddish brown.

Calculated Properties of Brackebuschite

Electron Density:

Bulk Density (Electron Density)=5.24 gm/cc
note: Specific Gravity of Brackebuschite =6.05 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_{Brackebuschite}= 984.80 barns/electron
U=PE_{Brackebuschite} x rElectron Density=5,161.36 barns/cc.

Radioactivity:

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

Brackebuschite Classification

Dana Class:

40.02.08.01 (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 Brackebuschite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Brackebuschite :
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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Brackebuschite

Pb2(Mn,Fe++)(VO4)2(OH)
Dana No: 40.02.08.01 Strunz No: 08.BG.05
Locality:

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