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Phosphofibrite Mineral Data

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General Phosphofibrite Information

Help on Chemical  Formula: Chemical Formula: KCuFe+++15(PO4)12(OH)12•12(H2O)
Help on Composition: Composition: Molecular Weight = 2,500.28 gm
   Potassium    1.56 %  K     1.88 % K2O
   Iron        33.50 %  Fe   47.90 % Fe2O3
   Copper       2.54 %  Cu    3.18 % CuO
   Phosphorus  14.87 %  P    34.06 % P2O5
   Hydrogen     1.45 %  H    12.97 % H2O
   Oxygen      46.07 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KCuFe3+15(PO4)12(OH)12•12(H2O)
Help on Environment: Environment: In a hydrothermal polymetallic barite-fluorite deposit.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Clara mine, near Oberwolfach, Black Forest, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for phosphorus in the composition and its characteristic fibrous habit.
Help on Name Pronunciation: Name Pronunciation: Phosphofibrite + Pronunciation Say PHOSPHOFIBRITE

Phosphofibrite Image

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  Phosphofibrite   Crandallite

Comments: Olive-green colored fibrous phosphofibrite aggregates with white crandallite.
Location: Silver Coin Mine, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Phosphofibrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7675:1:0.5543
Help on Cell Dimensions: Cell Dimensions: a = 14.4, b = 18.76, c = 10.4, Z = 2; V = 2,809.50 Den(Calc)= 2.96
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbmn,Pnmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.5(1), 3.13(0.6), 4.35(0.5),

Physical Properties of Phosphofibrite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Yellow, Yellow green.
Help on Density: Density: 2.9
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Phosphofibrite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), a=1.755, g=1.79, bire=0.0350

Calculated Properties of Phosphofibrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.85 gm/cc
note: Specific Gravity of Phosphofibrite =2.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0073281558
Boson Index = 0.9926718442
Help on Photoelectric: Photoelectric: PEPhosphofibrite = 11.91 barns/electron
U=PEPhosphofibrite x relectron= 34.00 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.13)Dana Type
  (42.13.10)Dana Group Phosphofibrite KCuFe15(PO4)12(OH)12•12(H2O) Pbmn,Pnmn 2/m 2/m 2/m
Help on  Strunz Class: 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

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 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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Dana No: Strunz No: 08.DJ.20





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