Ferrostrunzite Mineral Data

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.

Name Pronunciation:

Ferrostrunzite + Pronunciation

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

Diaphaneity:

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

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2637,KPDmeas= 0.2711,KC= 0.2655
Ncalc = 1.66 - 1.68

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:

Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Ferrostrunzite =2.57 gm/cc.

Fermion Index:

Fermion Index = 0.0073597563
Boson Index = 0.9926402437

Photoelectric:

PE_{Ferrostrunzite}= 10.43 barns/electron
U=PE_{Ferrostrunzite} x rElectron Density= 26.81 barns/cc.

Radioactivity:

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

Ferrostrunzite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · 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 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 - 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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Ask about Ferrostrunzite here :
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Print or Cut-and-Paste your Ferrostrunzite Specimen Label here :

Ferrostrunzite

Fe++Fe+++2(PO4)2(OH)2•6(H2O)
Dana No: 42.11.09.02 Strunz No: 08.DC.25
Locality:

Notes: