Mineralogy Database

Dufrenite Mineral Data

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General Dufrenite Information

Help on Chemical  Formula: Chemical Formula: Fe++Fe+++4(PO4)3(OH)5•2(H2O)
Help on Composition: Composition: Molecular Weight = 685.22 gm
   Iron        40.75 %  Fe   10.49 % FeO / 46.61 % Fe2O3
   Phosphorus  13.56 %  P    31.07 % P2O5
   Hydrogen     1.32 %  H    11.83 % H2O
   Oxygen      44.36 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Fe3+4(PO4)3(OH)5•2(H2O)
Help on Environment: Environment: Secondary mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1833
Help on Locality: Locality: Anglar, Haute-Vienne, Limousin, France Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Armand Small Dufrenoy (1792-1857), French mineralogist and geologist.
Help on Name Pronunciation: Name Pronunciation: Dufrenite + Pronunciation Say DUFRENITE
Help on Synonym: Synonym: ICSD 34830
  PDF 22-1143

Dufrenite Image

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Comments: Dark olive-greenish crystal of dufrenite on matrix.
Location: Rengersdorf, Görlitz, Oberlausitz, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Dufrenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =5.0409:1:2.6882
Help on Cell Dimensions: Cell Dimensions: a = 25.84, b = 5.126, c = 13.78, Z = 4; beta = 111.2° V = 1,701.72 Den(Calc)= 2.67
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.151(1), 5.002(0.9), 12(0.9),

Physical Properties of Dufrenite

Help on Cleavage: Cleavage: {???} Perfect, {???} Distinct
Help on Color: Color: Brown, Greenish brown, Green black, Dark green, Olive green.
Help on Density: Density: 3.2 - 3.4, Average = 3.3
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Silky
Help on Streak: Streak: green

Optical Properties of Dufrenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.218 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.321,KPDmeas= 0.2597,KC= 0.2636
Ncalc = 1.7 - 1.9
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.82-1.842, b=1.83-1.85, g=1.875-1.925, bire=0.0550-0.0830, 2V(Calc)=38-52, 2V(Meas)=0-90. Dispersion relatively strong.

Calculated Properties of Dufrenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Dufrenite =3.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0088542214
Boson Index = 0.9911457786
Help on Photoelectric: Photoelectric: PEDufrenite = 12.78 barns/electron
U=PEDufrenite x rElectron Density= 41.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dufrenite is Not Radioactive

Dufrenite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.09)where (A)3 (XO4)2 Zq � x(H2O)
  (42.09.01)Burangaite Group Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12•4(H2O) C 2/c 2/m Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6•2(H2O) C 2/c 2/m IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m Matioliite! NaMgAl5(PO4)4(OH)6•2H2O C 2/c 2/m
Help on  Strunz Class: Strunz Class: 08.DK.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
08.DK.15 Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m
08.DK.15 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12•4(H2O) C 2/c 2/m
08.DK.15 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6•2(H2O) C 2/c 2/m
08.DK.15 Matioliite! NaMgAl5(PO4)4(OH)6•2H2O C 2/c 2/m
08.DK.15 IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m

Other Dufrenite Information

Help on References: References: NAME( Dana7) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Dufrenite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 08.DK.15





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