Kolfanite Mineral Data

Kolfanite Mineral Data
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General Kolfanite Information

Help on Chemical Formula: Chemical Formula: Ca2Fe+++3O2(AsO4)3•2(H2O)
Help on Composition: Composition: Molecular Weight = 732.48 gm
   Calcium   10.94 %  Ca   15.31 % CaO
   Iron      22.87 %  Fe   32.70 % Fe2O3
   Arsenic   30.69 %  As   47.07 % As2O5
   Hydrogen   0.55 %  H     4.92 % H2O
   Oxygen    34.95 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Fe3+3O2(AsO4)3•2(H2O)
Help on Environment: Environment: An alteration product of holtite in a hydrothermally altered granite pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Mt. Vasin-Myl’k, Voron’i massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the abbreviation for the Russian KOL’skii Filial Akademii Nauk SSSR [Kola Branch of the Academy of Sciences of the USSR].
Help on Name Pronunciation: Name Pronunciation: Kolfanite + Pronunciation Say KOLFANITE
 

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Kolfanite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9084:1:0.5651
Help on Cell Dimensions: Cell Dimensions: a = 17.86, b = 19.66, c = 11.11, Z = 12; beta = 96° V = 3,879.66 Den(Calc)= 3.76
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.72(1), 8.9(1), 3.29(0.9),
 

Physical Properties of Kolfanite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Yellow, Orange, Red.
Help on Density: Density: 3.3
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Adamantine
Help on Streak: Streak: orange
 

Optical Properties of Kolfanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.18 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2363,KPDmeas= 0.2693,KC= 0.2281
Ncalc = 1.75 - 1.86
Help on Optical Data: Optical Data: Biaxial (-), a=1.81, b=1.923, g=1.933, bire=0.1230, 2V(Calc)=30, 2V(Meas)=5-7.
 

Calculated Properties of Kolfanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Kolfanite =3.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0051653827
Boson Index = 0.9948346173
Help on Photoelectric: Photoelectric: PEKolfanite = 29.25 barns/electron
U=PEKolfanite x rElectron Density= 104.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kolfanite is Not Radioactive
 

Kolfanite Classification
Help on Dana Class: Dana Class: 42.08.05.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.08)where (AB)7 (XO4)4 Zq · x(H2O)
  (42.08.05)Kolfanite Group
 
42.08.05.01 Kolfanite Ca2Fe3O2(AsO4)3•2(H2O) A2/a 2/m
 
42.08.05.02 Pararobertsite Ca2Mn3(PO4)3O2•3(H2O) P 21/c 2/m
 
42.08.05.03 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)•3(H2O) Cm m
Help on Strunz Class: Strunz Class: 08.DH.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
 
08.DH.30 Arseniosiderite Ca2Fe3(AsO4)3O2•3(H2O) A2/a 2/m
 
08.DH.30 Pararobertsite Ca2Mn3(PO4)3O2•3(H2O) P 21/c 2/m
 
08.DH.30 Kolfanite Ca2Fe3O2(AsO4)3•2(H2O) A2/a 2/m
 
08.DH.30 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m
 
08.DH.30 Robertsite Ca6Mn9(PO4)9O6(H2O)6•3(H2O) A2/a 2/m
 
08.DH.30 Mitridatite Ca2Fe3(PO4)3O2•3(H2O) A2/a 2/m
 
08.DH.30 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)•3(H2O) Cm m
 

Other Kolfanite Information
Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Kolfanite :
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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Kolfanite

Ca2Fe+++3O2(AsO4)3•2(H2O)
Dana No: 42.08.05.01 Strunz No: 08.DH.30
Locality:

 

Notes: