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Brackebuschite Mineral Data

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General Brackebuschite Information

Help on Chemical  Formula: Chemical Formula: Pb2(Mn,Fe++)(VO4)2(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb1.9Mn3+0.5Fe3+0.5Zn0.1(VO4)21.6(OH)
Help on Environment: Environment: Secondary mineral in the oxidized zone of hydrothermal Pb-Zn deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1880
Help on Locality: Locality: Venus, Agua del Rubio, Benvenida, Pilar, and Algarrobites mines, El Guaico District, Sierra de Cordoba, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ludwig Brackebusch (1849-1906), Professor of Mineralogy, University of Cordoba, Cordove, Argentina.
Help on Name Pronunciation: Name Pronunciation: Brackebuschite + Pronunciation Say BRACKEBUSCHITE
Help on Synonym: Synonym: ICSD 76869
  PDF 29-1428

Brackebuschite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =1.4427:1:1.2479
Help on Cell Dimensions: Cell Dimensions: a = 8.88, b = 6.155, c = 7.681, Z = 2; beta = 111° V = 391.93 Den(Calc)= 6.04
Help on Crystal System: 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/Io): 3.25(1), 2.76(0.8), 4.95(0.8),

Physical Properties of Brackebuschite

Help on Color: Color: Dark brown, Black.
Help on Density: Density: 6.05
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Habit: Habit: Wedge shaped - Crystals shaped like a wedge.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: yellow

Optical Properties of Brackebuschite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): nearly colorless.
Help on Pleochroism (y): Pleochroism (y): dark reddish brown.
Help on Pleochroism (z): Pleochroism (z): reddish brown.

Calculated Properties of Brackebuschite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.24 gm/cc
note: Specific Gravity of Brackebuschite =6.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PEBrackebuschite = 984.80 barns/electron
U=PEBrackebuschite x rElectron Density=5,161.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brackebuschite is Not Radioactive

Brackebuschite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.08)Brackebushite Group Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 21/m 2/m Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2•(H2O) P 21/m 2/m Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2•(H2O) P 21,P 21/m Mono Calderonite! Pb2Fe(VO4)2(OH) P 21/m 2/m Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 21/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: 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

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Dana No: Strunz No: 08.BG.05





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