Ferristrunzite Mineral Data

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.

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:

TriclinicSpace 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

Diaphaniety:

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= 0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2616,KPDmeas= 0.2895,KC= 0.2853

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:

r_electron=2.45 gm/cc
note: r_{Ferristrunzite}=2.44 gm/cc.

Fermion Index

Fermion Index = 0.00713
Boson Index = 0.99287

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferristrunzite is Not Radioactive

Ferristrunzite Classification

Dana Class:

42.11.9.3 (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.11-30 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 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 - Minerals of Wisconsin 12 -QUT Mineral Atlas 13 -École des Mines de Paris

Search for Ferristrunzite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Ferristrunzite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Ferristrunzite Mineral Data :

Ask about Ferristrunzite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ferristrunzite Specimen Label here :

Ferristrunzite

Fe+++Fe+++2(PO4)2(OH)3·5(H2O)
Dana No: 42.11.9.3 Strunz No: VII/D.11-30
Locality:

Notes: