Phosphofibrite Mineral Data
General Phosphofibrite Information
Chemical Formula:
KCuFe+++15(PO4)12(OH)12•12(H2O)
Composition:
Molecular Weight = 2,500.28 gm
Potassium 1.56 % K 1.88 % K2 O
Iron 33.50 % Fe 47.90 % Fe2 O3
Copper 2.54 % Cu 3.18 % CuO
Phosphorus 14.87 % P 34.06 % P2 O5
Hydrogen 1.45 % H 12.97 % H2 O
Oxygen 46.07 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
KCuFe3+ 15 (PO4 )12 (OH)12 •12(H2 O)
Environment:
In a hydrothermal polymetallic barite-fluorite deposit.
IMA Status:
Approved IMA 1984
Locality:
Clara mine, near Oberwolfach, Black Forest, Germany. Link to MinDat.org Location Data.
Name Origin:
Named for phosphorus in the composition and its characteristic fibrous habit.
Name Pronunciation:
Phosphofibrite + Pronunciation
Phosphofibrite Image
Images:
Phosphofibrite Crystallography
Axial Ratios:
a:b:c =0.7675:1:0.5543
Cell Dimensions:
a = 14.4, b = 18.76, c = 10.4, Z = 2; V = 2,809.50 Den(Calc)= 2.96
Crystal System:
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbmn,Pnmn
X Ray Diffraction:
By Intensity(I/Io ): 9.5(1), 3.13(0.6), 4.35(0.5),
Physical Properties of Phosphofibrite
Cleavage:
{???} Good
Color:
Yellow, Yellow green.
Density:
2.9
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Optical Properties of Phosphofibrite
Gladstone-Dale:
CI meas = 0 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0.02 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.261,KPDmeas = 0.2664,KC = 0.2664 Ncalc = 1.77 - 1.79
Optical Data:
Biaxial (-), a=1.755, g=1.79, bire=0.0350
Calculated Properties of Phosphofibrite
Electron Density:
Bulk Density (Electron Density)=2.85 gm/cc note: Specific Gravity of Phosphofibrite =2.90 gm/cc.
Fermion Index:
Fermion Index = 0.0073281558 Boson Index = 0.9926718442
Photoelectric:
PEPhosphofibrite = 11.91 barns/electronU=PEPhosphofibrite x r electron = 34.00 barns/cc.
Radioactivity:
GRapi = 22.21 (Gamma Ray American Petroleum Institute Units)
Concentration of Phosphofibrite per GRapi unit = 4.50 (%)
Estimated Radioactivity from Phosphofibrite - barely detectable
Phosphofibrite Classification
Dana Class:
42.13.10.01 (42) Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.13) Dana Type
(42.13.10) Dana Group
42.13.10.01 Phosphofibrite KCuFe15(PO4)12(OH)12•12(H2O) Pbmn,Pnmn 2/m 2/m 2/m
Strunz Class:
08.DJ.20 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DJ -With large and medium-sized cations, (OH, etc.):RO4 = 1:l
08.DJ.20 Meurigite-K ! [K(H2O)2.5][Fe8(PO4)6(OH)7(H2O)4] C 2/c 2/m
08.DJ.20 Phosphofibrite KCuFe15(PO4)12(OH)12•12(H2O) Pbmn,Pnmn 2/m 2/m 2/m
08.DJ.20 Meurigite-Na ! [Na(H2O)2.5][Fe8(PO4)6(OH)7(H2O)4] C 2/c 2/m
Other Phosphofibrite 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 Phosphofibrite :
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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Phosphofibrite
KCuFe+++15(PO4)12(OH)12•12(H2O)
Dana No: 42.13.10.01 Strunz No: 08.DJ.20
Locality:
Notes:
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