Ferristrunzite Mineral Data

General Ferristrunzite Information

Chemical Formula:

Fe+++Fe+++2(PO4)2(OH)3•5(H2O)

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

Empirical Formula:

Fe³⁺Fe³⁺₂(PO₄)₂(OH)₃•6(H₂O)

Environment:

Secondary phosphate mineral.

IMA Status:

Approved IMA 1987

Locality:

Blaton, Belgium. Link to MinDat.org Location Data.

Name Origin:

Named for its composition and for Hugo Strunz (1910-), mineralogist, Berlin, who authored the Strunz system of mineral classification.

Name Pronunciation:

Ferristrunzite + Pronunciation

Ferristrunzite Image

Images:

Ferristrunzite

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

Axial Ratios:

a:b:c =1.0287:1:0.7537

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

Crystal System:

Triclinic Space Group: P1,P 1

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

By Intensity(I/I_o): 5.34(1), 8.87(0.8), 3.267(0.4),

Physical Properties of Ferristrunzite

Cleavage:

{???} Good

Color:

Brownish yellow, Light yellow.

Density:

2.38 - 2.5, Average = 2.44

Diaphaneity:

Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Ferristrunzite

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

Optical Data:

Biaxial (+), a=1.664, b=1.698, g=1.757, bire=0.0930, 2V(Calc)=78, 2V(Meas)=77.

Pleochroism (x):

greenish yellow.

Pleochroism (z):

brownish yellow.

Calculated Properties of Ferristrunzite

Electron Density:

Bulk Density (Electron Density)=2.45 gm/cc
note: Specific Gravity of Ferristrunzite =2.44 gm/cc.

Fermion Index:

Fermion Index = 0.0071326182
Boson Index = 0.9928673818

Photoelectric:

PE_{Ferristrunzite}= 10.08 barns/electron
U=PE_{Ferristrunzite} x rElectron Density= 24.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferristrunzite is Not Radioactive

Ferristrunzite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.09)Strunzite Group

42.11.09.01 Strunzite MnFe2(PO4)2(OH)2•6(H2O) P1 1

42.11.09.02 Ferrostrunzite FeFe2(PO4)2(OH)2•6(H2O) P 1,P1 Tri

42.11.09.03 Ferristrunzite FeFe2(PO4)2(OH)3•5(H2O) P1,P 1 Tri

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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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Ferristrunzite

Fe+++Fe+++2(PO4)2(OH)3•5(H2O)
Dana No: 42.11.09.03 Strunz No: 08.DC.25
Locality:

Notes:

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