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Bendadaite Mineral Data

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General Bendadaite Information

Help on Chemical  Formula: Chemical Formula: Fe++Fe+++2(AsO4)2(OH)2•4H2O
Help on Composition: Composition: Molecular Weight = 551.46 gm
   Iron      30.38 %  Fe   13.03 % FeO / 28.96 % Fe2O3
   Arsenic   27.17 %  As   41.68 % As2O5
   Hydrogen   1.83 %  H    16.33 % H2O
   Oxygen    40.62 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Fe3+2(AsO4)2(OH)2•4(H2O)
Help on Environment: Environment: Whitmoreite group
Help on IMA Status: IMA Status: Proposed IMA 2007 (Dana # Added)
Help on Locality: Locality: Bendada near Guarda, province Beira Alta, central Portugal Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Synonym: Synonym: IMA1998-053a
 

Bendadaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0541:1:0.5716
Help on Cell Dimensions: Cell Dimensions: a = 10.239, b = 9.713, c = 5.552, Z = 2; beta = 94.11° V = 550.73 Den(Calc)= 3.33
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.22(1), 7.036(0.8), 4.25(0.5),2.865(0.4), 2.907(0.3), 4.833(0.3), 3.49(0.2), 4.52(0.2),
 

Optical Properties of Bendadaite

Help on Optical Data: Optical Data: NCalc= 1.8 - from Gladstone-Dale relationship (KC = 0.2388) where Ncalc=Dcalc*KC+1
 

Calculated Properties of Bendadaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Bendadaite =3.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0066386119
Boson Index = 0.9933613881
Help on Photoelectric: Photoelectric: PEBendadaite = 27.45 barns/electron
U=PEBendadaite x rElectron Density= 88.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bendadaite is Not Radioactive
 

Bendadaite Classification

Help on  Dana Class: Dana Class: 42.11.18.08 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.18)Whitmoreite Group
 
42.11.18.01 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 21/c 2/m
 
42.11.18.02 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 21/c 2/m
 
42.11.18.03 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m
 
42.11.18.04 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 21/c 2/m
 
42.11.18.05 Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13•H2O P 21/n 2/m
 
42.11.18.06 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m
 
42.11.18.07 Kunatite CuFe2(PO4)2(OH)2•4H2O P 21/c 2/m
 
42.11.18.08 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.DC.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
 
08.DC.15 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 21/c 2/m
 
08.DC.15 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 21/c 2/m
 
08.DC.15 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m
 
08.DC.15 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 21/c 2/m
 
08.DC.15 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 21/c 2/m
 
08.DC.15 Kunatite CuFe2(PO4)2(OH)2•4H2O P 21/c 2/m
 
08.DC.15 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 21/c 2/m
 

Other Bendadaite Information

Help on See Also: See Also: Links to other databases for Bendadaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Bendadaite

Fe++Fe+++2(AsO4)2(OH)2•4H2O
Dana No: 42.11.18.08 Strunz No: 08.DC.15
Locality:

 

Notes:

 

 
   
 


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