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Ferristrunzite Mineral Data

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General Ferristrunzite Information

Help on Chemical  Formula: Chemical Formula: Fe+++Fe+++2(PO4)2(OH)3•5(H2O)
Help on Composition: Composition: Molecular Weight = 516.60 gm
   Iron        32.43 %  Fe   46.37 % Fe2O3
   Phosphorus  11.99 %  P    27.48 % P2O5
   Hydrogen     2.93 %  H    26.15 % H2O
   Oxygen      52.65 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+Fe3+2(PO4)2(OH)3•6(H2O)
Help on Environment: Environment: Secondary phosphate mineral.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Blaton, Belgium. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition and for Hugo Strunz (1910-), mineralogist, Berlin, who authored the Strunz system of mineral classification.
Help on Name Pronunciation: Name Pronunciation: Ferristrunzite + Pronunciation Say FERRISTRUNZITE

Ferristrunzite Image

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Comments: Radiating yellow crystals of ferristrunzite on black matrix.
Location: Blaton, Hainaut (Henegouwen; Hennegau) Province, Belgium. Scale: 35x25x15 mm.
© John Betts - Fine Minerals

Ferristrunzite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0287:1:0.7537
Help on Cell Dimensions: Cell Dimensions: a = 10.01, b = 9.73, c = 7.334, Z = 2; alpha = 90.5°, beta = 97°, gamma = 116.43° V = 634.86 Den(Calc)= 2.70
Help on Crystal System: Crystal System: Triclinic Space Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.34(1), 8.87(0.8), 3.267(0.4),

Physical Properties of Ferristrunzite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Brownish yellow, Light yellow.
Help on Density: Density: 2.38 - 2.5, Average = 2.44
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow

Optical Properties of Ferristrunzite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2606,KPDmeas= 0.2895,KC= 0.2853
Ncalc = 1.68 - 1.77
Help on Optical Data: Optical Data: Biaxial (+), a=1.664, b=1.698, g=1.757, bire=0.0930, 2V(Calc)=78, 2V(Meas)=77.
Help on Pleochroism (x): Pleochroism (x): greenish yellow.
Help on Pleochroism (z): Pleochroism (z): brownish yellow.

Calculated Properties of Ferristrunzite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.45 gm/cc
note: Specific Gravity of Ferristrunzite =2.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0071326182
Boson Index = 0.9928673818
Help on Photoelectric: Photoelectric: PEFerristrunzite = 10.08 barns/electron
U=PEFerristrunzite x rElectron Density= 24.65 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferristrunzite is Not Radioactive

Ferristrunzite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.09)Strunzite Group Strunzite MnFe2(PO4)2(OH)2•6(H2O) P1 1 Ferrostrunzite FeFe2(PO4)2(OH)2•6(H2O) P 1,P1 Tri Ferristrunzite FeFe2(PO4)2(OH)3•5(H2O) P1,P 1 Tri
Help on  Strunz Class: Strunz Class: 08.DC.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
08.DC.25 Ferrostrunzite FeFe2(PO4)2(OH)2•6(H2O) P 1,P1 Tri
08.DC.25 Ferristrunzite FeFe2(PO4)2(OH)3•5(H2O) P1,P 1 Tri
08.DC.25 Metavauxite FeAl2(PO4)2(OH)2•8(H2O) P 21/c 2/m
08.DC.25 Strunzite MnFe2(PO4)2(OH)2•6(H2O) P1 1

Other Ferristrunzite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Ferristrunzite :
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.DC.25





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