Mineralogy Database

Bracewellite Mineral Data

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General Bracewellite Information

Help on Chemical  Formula: Chemical Formula: Cr+++O(OH)
Help on Composition: Composition: Molecular Weight = 85.00 gm
   Chromium  61.17 %  Cr   89.40 % Cr2O3
   Hydrogen   1.19 %  H    10.60 % H2O
   Oxygen    37.64 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CrO(OH)
Help on Environment: Environment: Adjacent to an incrusting ullmannite in oxidized hydrothermal base-metal deposits.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Merume River Basin, Mazaruni, Guyana Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Smith Bracewell, Director of the British Guiana (now Guyana) Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Bracewellite + Pronunciation Say BRACEWELLITE
Help on Synonym: Synonym: ICSD 27517
  PDF 25-1497
 

Bracewellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4555:1:0.3016
Help on Cell Dimensions: Cell Dimensions: a = 4.492, b = 9.86, c = 2.974, Z = 4; V = 131.72 Den(Calc)= 4.29
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.09(1), 2.65(0.8), 2.546(0.7),
 

Physical Properties of Bracewellite

Help on Color: Color: Dark reddish brown, Reddish brown, Black.
Help on Density: Density: 4.45 - 4.48, Average = 4.46
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Hardness: Hardness: 5.5-6.5 - Knife Blade-Pyrite
Help on Luster: Luster: Adamantine - Metallic
Help on Streak: Streak: dark brown
 

Optical Properties of Bracewellite

Help on Optical Data: Optical Data: NCalc= 2.27 - from Gladstone-Dale relationship (KC = 0.2953) where Ncalc=Dcalc*KC+1
NCalc= 2.32 - from Gladstone-Dale relationship (KC = 0.2953) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Bracewellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Bracewellite =4.29 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEBracewellite = 13.79 barns/electron
U=PEBracewellite x rElectron Density= 57.08 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bracewellite is Not Radioactive
 

Bracewellite Classification

Help on  Dana Class: Dana Class: 06.01.01.05 (06)Hydroxides and Oxides Containing Hydroxyl
  (06.01)where X+++O OH
  (06.01.01)Diaspore group (Orthorhombic, Pnma or Pnmd)
 
06.01.01.01 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
 
06.01.01.02 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
 
06.01.01.03 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
 
06.01.01.04 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m
 
06.01.01.05 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m
 
06.01.01.06 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.FD.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra
 
04.FD.10 Bracewellite CrO(OH) Pbnm 2/m 2/m 2/m
 
04.FD.10 Diaspore AlO(OH) Pbnm 2/m 2/m 2/m
 
04.FD.10 Guyanaite CrO(OH) Pnnm 2/m 2/m 2/m
 
04.FD.10 Groutite MnO(OH) Pbnm 2/m 2/m 2/m
 
04.FD.10 Goethite FeO(OH) Pbnm 2/m 2/m 2/m
 
04.FD.10 Montroseite (V,Fe,V)O(OH) Pbnm 2/m 2/m 2/m
 
04.FD.10 Tsumgallite! GaO(OH) Pbnm 2/m 2/m 2/m
 

Other Bracewellite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Bracewellite :
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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Print or Cut-and-Paste your Bracewellite Specimen Label here :

Bracewellite

Cr+++O(OH)
Dana No: 06.01.01.05 Strunz No: 04.FD.10
Locality:

 

Notes:

 

 
   
 


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