Kolfanite Mineral Data

Kolfanite Mineral Data +

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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)

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

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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 - PrismaticH-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

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:

r_electron=3.58 gm/cc
note: r_Kolfanite=3.76 gm/cc.

Fermion Index

Fermion Index = 0.00516
Boson Index = 0.99484

Photoelectric:

PE_Kolfanite= 29.25 barns/electron
U=PE_Kolfanite x r_electron= 104.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kolfanite is Not Radioactive

Kolfanite Classification

Dana Class:

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

(42.8)where (AB)7 (XO4)4 Zq · x(H2O)

(42.8.5)Dana Group

42.8.5.1 Kolfanite Ca2Fe3O2(AsO4)3·2(H2O) A2/a 2/m

42.8.5.2 Pararobertsite Ca2Mn3(PO4)3O2·3(H2O) P 2₁/c 2/m

42.8.5.3 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)·3(H2O) Cm m

Strunz Class:

VII/D.30-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.30 - Mitridatite series

VII/D.30-10 Xanthoxenite Ca4Fe2(PO4)4(OH)2·3(H2O) P1 1

VII/D.30-20 Kolfanite Ca2Fe3O2(AsO4)3·2(H2O) A2/a 2/m

VII/D.30-30 Mitridatite Ca2Fe3(PO4)3O2·3(H2O) A2/a 2/m

VII/D.30-40 Arseniosiderite Ca2Fe3(AsO4)3O2·3(H2O) A2/a 2/m

VII/D.30-45 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)·3(H2O) Cm m

VII/D.30-50 Robertsite Ca6Mn9(PO4)9O6(H2O)6·3(H2O) A2/a 2/m

VII/D.30-60 Pararobertsite Ca2Mn3(PO4)3O2·3(H2O) P 2₁/c 2/m

Other Kolfanite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Kolfanite

Ca2Fe+++3O2(AsO4)3·2(H2O)
Dana No: 42.8.5.1 Strunz No: VII/D.30-20
Locality:

Notes: