Ferrostrunzite Mineral Data

Ferrostrunzite Mineral Data +

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General Ferrostrunzite Information

Chemical Formula:

Fe++Fe+++2(PO4)2(OH)2·6(H2O)

Composition:

Molecular Weight = 499.59 gm

Iron 33.54 % Fe 14.38 % FeO / 31.96 % Fe₂O₃

Phosphorus 12.40 % P 28.41 % P₂O₅

Hydrogen 2.82 % H 25.24 % H₂O

Oxygen 51.24 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂·6(H₂O)

Environment:

Secondary mineral in sedimentary rocks replacing rockbridgeite.

IMA Status:

Approved IMA 1983

Locality:

Mullica Hill, New Jersey, USA. 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.

Ferrostrunzite Image

Images:

Ferrostrunzite

Comments: Yellowish acicular crystals of ferrostrunzite.
Location: Gravel Hill mine, Perranzabuloe, Cornwall, England, UK. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Ferrostrunzite Crystallography

Axial Ratios:

a:b:c =1.047:1:0.7543

Cell Dimensions:

a = 10.23, b = 9.77, c = 7.37, Z = 2; alpha = 89.65°, beta = 98.28°, gamma = 117.26° V = 647.96 Den(Calc)= 2.56

Crystal System:

TriclinicSpace Group: P 1,P1

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

By Intensity(I/I_o): 5.29(1), 8.94(0.8), 3.277(0.4),

Physical Properties of Ferrostrunzite

Cleavage:

[???] Good

Color:

Yellow brown, Light brown, Colorless.

Density:

2.5

Diaphaniety:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Ferrostrunzite

Optical Data:

Biaxial (-), a=1.628, b=1.682, g=1.723, bire=0.0950, 2V(Calc)=78, 2V(Meas)=80.

Pleochroism (x):

pale yellow green.

Pleochroism (z):

pale red yellow.

Calculated Properties of Ferrostrunzite

Electron Density:

r_electron=2.56 gm/cc
note: r_{Ferrostrunzite}=2.56 gm/cc.

Fermion Index

Fermion Index = 0.00735
Boson Index = 0.99265

Photoelectric:

PE_{Ferrostrunzite}= 10.43 barns/electron
U=PE_{Ferrostrunzite} x r_electron= 26.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrostrunzite is Not Radioactive

Ferrostrunzite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.9)Dana Group

42.11.9.1 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

42.11.9.2 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

42.11.9.3 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

Strunz Class:

VII/D.11-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Ferrostrunzite Information

References:

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

See Also:

Links to other databases for Ferrostrunzite :
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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Ferrostrunzite

Fe++Fe+++2(PO4)2(OH)2·6(H2O)
Dana No: 42.11.9.2 Strunz No: VII/D.11-10
Locality:

Notes: