Kolfanite Mineral Data

General Kolfanite Information

Chemical Formula:

Ca2Fe+++3O2(AsO4)3•2(H2O)

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

Empirical Formula:

Ca₂Fe³⁺₃O₂(AsO₄)₃•2(H₂O)

Environment:

An alteration product of holtite in a hydrothermally altered granite pegmatite.

IMA Status:

Approved IMA 1982

Locality:

Mt. Vasin-Mylï¿½k, Voronï¿½i massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named from the abbreviation for the Russian KOLï¿½skii Filial Akademii Nauk SSSR [Kola Branch of the Academy of Sciences of the USSR].

Name Pronunciation:

Kolfanite + Pronunciation

Kolfanite Crystallography

Axial Ratios:

a:b:c =0.9084:1:0.5651

Cell Dimensions:

a = 17.86, b = 19.66, c = 11.11, Z = 12; beta = 96° V = 3,879.66 Den(Calc)= 3.76

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.72(1), 8.9(1), 3.29(0.9),

Physical Properties of Kolfanite

Cleavage:

{???} Good

Color:

Yellow, Orange, Red.

Density:

3.3

Hardness:

2.5 - Finger Nail

Luster:

Adamantine

Streak:

orange

Optical Properties of Kolfanite

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

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

Electron Density:

Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Kolfanite =3.76 gm/cc.

Fermion Index:

Fermion Index = 0.0051653827
Boson Index = 0.9948346173

Photoelectric:

PE_Kolfanite= 29.25 barns/electron
U=PE_Kolfanite x rElectron Density= 104.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kolfanite is Not Radioactive

Kolfanite Classification

Dana Class:

42.08.05.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.08)where (AB)7 (XO4)4 Zq ï¿½ 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

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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:

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