Phosphoferrite Mineral Data

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General Phosphoferrite Information

Chemical Formula:

(Fe++,Mn)3(PO4)2•3(H2O)

Composition:

Molecular Weight = 410.85 gm

Manganese 10.03 % Mn 12.95 % MnO

Iron 30.58 % Fe 39.35 % FeO

Phosphorus 15.08 % P 34.55 % P₂O₅

Hydrogen 1.47 % H 13.15 % H₂O

Oxygen 42.84 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

3(Fe²⁺_0.75)3(Mn²⁺_0.25)(PO₄)₂•3(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1926

Locality:

Hagendorf Sud, near Pleystein, Oberpfalz, Bavaria, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the compositoin, PHOSPHate and FERRous Iron.

Name Pronunciation:

Phosphoferrite

Synonym:

ICSD 302

PDF 9-479

Phosphoferrite Image

Images:

Phosphoferrite

Comments: Translucent, brown crystal of phosphoferrite on matrix.
Location: Big Chief mine, Keystone, Pennington County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Phosphoferrite Crystallography

Axial Ratios:

a:b:c =0.9391:1:0.8642

Cell Dimensions:

a = 9.41, b = 10.02, c = 8.66, Z = 4; V = 816.54 Den(Calc)= 3.34

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmna

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

By Intensity(I/I_o): 3.18(1), 2.724(0.8), 4.25(0.7),

Forms:

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Forms: ( 1 0 1) ( 0 2 2) ( 1 1 2) ( 0 1 0) ( 1 1 1) ( 2 1 2) ( 1 2 2) ( 1 0 0) ( 1 0 2) ( 0 0 1)

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Crystal Structure:

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Eversheim P , Kleber W , Acta Crystallographica , 6 (1953) p.215-216, Morphologie und struktur des reddingits, P2O5*3FeO*3H2O, Note: z(FeII) adjusted to match symmetry constraint

Physical Properties of Phosphoferrite

Cleavage:

{010} Indistinct

Color:

Colorless, Light green, Dark reddish brown, Reddish brown.

Density:

3.29

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Phosphoferrite

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2048,KPDmeas= 0.2079,KC= 0.2074
Ncalc = 1.68 - 1.69

Optical Data:

Biaxial (+), a=1.672, b=1.68, g=1.7, bire=0.0280, 2V(Calc)=66, 2V(Meas)=68. Dispersion r > v distinct.

Calculated Properties of Phosphoferrite

Electron Density:

Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Phosphoferrite =3.29 gm/cc.

Fermion Index:

Fermion Index = 0.0066917373
Boson Index = 0.9933082627

Photoelectric:

PE_{Phosphoferrite}= 12.37 barns/electron
U=PE_{Phosphoferrite} x rElectron Density= 39.86 barns/cc.

Radioactivity:

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

Phosphoferrite Classification

Dana Class:

40.03.02.01 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 · x(H2O)

(40.03.02)Phosphoferrite Group

40.03.02.01 Phosphoferrite (Fe,Mn)3(PO4)2•3(H2O) Pmna 2/m 2/m 2/m

40.03.02.02 Kryzhanovskite MnFe2(PO4)2(OH)2•(H2O) Pbna 2/m 2/m 2/m

40.03.02.03 Reddingite Mn3(PO4)2•3(H2O) Pbna 2/m 2/m 2/m

40.03.02.04 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3•9(H2O) Pmna 2/m 2/m 2/m

40.03.02.05 Garyansellite (Mg,Fe)3(PO4)2(OH,O)•1,5(H2O) Pbna 2/m 2/m 2/m

Strunz Class:

08.CC.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CC -With only medium-sized cations, RO4:H2O = 1:1.5

08.CC.05 Garyansellite (Mg,Fe)3(PO4)2(OH,O)•1,5(H2O) Pbna 2/m 2/m 2/m

08.CC.05 Kryzhanovskite MnFe2(PO4)2(OH)2•(H2O) Pbna 2/m 2/m 2/m

08.CC.05 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3•9(H2O) Pmna 2/m 2/m 2/m

08.CC.05 Phosphoferrite (Fe,Mn)3(PO4)2•3(H2O) Pmna 2/m 2/m 2/m

08.CC.05 Reddingite Mn3(PO4)2•3(H2O) Pbna 2/m 2/m 2/m

Other Phosphoferrite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Phosphoferrite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Phosphoferrite

(Fe++,Mn)3(PO4)2•3(H2O)
Dana No: 40.03.02.01 Strunz No: 08.CC.05
Locality:

Notes: