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:

Click Here for Larger Brackebuschite Image

Brackebuschite Krettnichite

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 - PrismaticH-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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Donaldson D M , Barnes W H , American Mineralogist , 40 (1955) p.597-613, The structures of the minerals of the descloizite and adelite groups: III-, brackebuschite

View Additional jPOWD Structure files for Brackebuschite
[1]

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) · 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

Search for Brackebuschite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Brackebuschite :

A Bijoux Google Search for Brackebuschite
Adam's Minerals Google Search for Brackebuschite
Cape Minerals Google Search for Brackebuschite
Dakota Matrix Minerals Google Search for Brackebuschite
Excalibur Mineral Corp. Google Search for Brackebuschite
Exceptional Minerals Google Search for Brackebuschite
John Betts Fine Minerals Search for Brackebuschite
McDougall Minerals Google Search for Brackebuschite
Mineral News Website Link
Rock and Mineral Shows Google Search for Brackebuschite
Weinrich Minerals, Inc. Google Search for Brackebuschite

Ask about Brackebuschite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Brackebuschite

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

Notes: