Phosphofibrite Mineral Data

Phosphofibrite Mineral Data +

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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 % 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

Empirical Formula:

KCuFe³⁺₁₅(PO₄)₁₂(OH)₁₂·12(H₂O)

IMA Status:

Approved IMA 1984

Locality:

Link to MinDat.org Location Data.

Phosphofibrite Image

Images:

Click Here for Larger Phosphofibrite Image

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbmn,Pnmn

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

By Intensity(I/I_o): 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

Optical Data:

Biaxial (-), a=1.755, g=1.79, bire=0.0350

Calculated Properties of Phosphofibrite

Electron Density:

r_electron=2.85 gm/cc
note: r_{Phosphofibrite}=2.90 gm/cc.

Fermion Index

Fermion Index = 0.00732
Boson Index = 0.99268

Photoelectric:

PE_{Phosphofibrite}= 11.91 barns/electron
U=PE_{Phosphofibrite} x r_electron= 34.00 barns/cc.

Radioactivity:

GRapi = 22.21 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Phosphofibrite - barely detectable

Phosphofibrite Classification

Dana Class:

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

(42.13)Dana Type

(42.13.10)Dana Group

42.13.10.1 Phosphofibrite KCuFe15(PO4)12(OH)12·12(H2O) Pbmn,Pnmn 2/m 2/m 2/m

Strunz Class:

VII/D.38-10 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.38 - Phosphofibrite series

VII/D.38-10 Phosphofibrite KCuFe15(PO4)12(OH)12·12(H2O) Pbmn,Pnmn 2/m 2/m 2/m

Other Phosphofibrite 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 Phosphofibrite :
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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Phosphofibrite

KCuFe+++15(PO4)12(OH)12·12(H2O)
Dana No: 42.13.10.1 Strunz No: VII/D.38-10
Locality:

Notes: