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Bernalite Mineral Data

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General Bernalite Information

Help on Chemical  Formula: Chemical Formula: Fe(OH)3
Help on Composition: Composition: Molecular Weight = 108.14 gm
   Zinc       1.21 %  Zn    1.51 % ZnO
   Iron      45.96 %  Fe   65.71 % Fe2O3
   Silicon    1.82 %  Si    3.89 % SiO2
   Hydrogen   2.80 %  H    24.99 % H2O
   Lead       3.83 %  Pb    4.13 % PbO
   Oxygen    44.38 %  O
            ______        ______ 
            100.00 %      100.22 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+0.89Si0.07Pb0.02Zn0.02(OH)3
Help on Environment: Environment: On a museum specimen from a metamorphosed Pb-Zn deposit, probably from the surface oxidation zone.
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: From the Proprietary mine, Broken Hill, New South Wales, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor John Desmond Bernal (1901-1971), eminent British crystallographer and historian of science.
Help on Name Pronunciation: Name Pronunciation: Bernalite + Pronunciation Say BERNALITE
Help on Synonym: Synonym: ICSD 73441
  PDF 46-1436

Bernalite Image

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Comments: B&W image of pseudo-octahedral crystals of bernalite on goethite. (AmMin, v78:827).
Location: Proprietary mine, Broken Hill, New South Wales, Australia. Scale: Scale Bar 3 mm.
© American Mineralogist

Bernalite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1:1:0.9913
Help on Cell Dimensions: Cell Dimensions: a = 7.6191, b = 7.6191, c = 7.5534, Z = 8; V = 438.48 Den(Calc)= 3.28
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.784(1), 1.692(0.17), 2.393(0.16),

Physical Properties of Bernalite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow green, Dark bottle green.
Help on Density: Density: 3.32
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: apple green

Optical Properties of Bernalite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.09 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.079 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2835,KPDmeas= 0.2801,KC= 0.3079
Ncalc = 2.01 - 2.02
Help on Optical Data: Optical Data: Biaxial (?), b=1.92-1.94

Calculated Properties of Bernalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Bernalite =3.28 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBernalite = 73.91 barns/electron
U=PEBernalite x rElectron Density= 239.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bernalite is Not Radioactive

Bernalite Classification

Help on  Dana Class: Dana Class: (06)Hydroxides and Oxides Containing Hydroxyl
  (06.03)with (OH)3 or (OH)6 groups
  (06.03.05)Dzhalindite Group Dzhalindite In(OH)3 I m3 2/m 3 Sohngeite Ga(OH)3 I m3 2/m 3 Bernalite Fe(OH)3 Pmmn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.FC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FC -Hydroxides with OH, without H2O; corner-sharing octahedra
04.FC.05 Bernalite Fe(OH)3 Pmmn 2/m 2/m 2/m
04.FC.05 Dzhalindite In(OH)3 I m3 2/m 3
04.FC.05 Sohngeite Ga(OH)3 I m3 2/m 3

Other Bernalite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,v78,p827, v91,p220) OPTIC PROP.(Am.Min.,Vol.78,p827-834,1993)
Help on See Also: See Also: Links to other databases for Bernalite :
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: 04.FC.05





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