Dufrenite Mineral Data

Dufrenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =5..&checktime(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 - PrismaticH-M Symbol (2/m) Space Group: C 2/c

Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/I_o): 3.151(1), 5.002(0.9), 12(0.9),

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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: PE_Dufrenite = 12.78 barns/electron
U=PE_Dufrenite 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: 42.09.01.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.09)where (A)3 (XO4)2 Zq ƒL x(H2O)

(42.09.01)Burangaite Group

42.09.01.01 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12•4(H2O) C 2/c 2/m

42.09.01.02 Dufrenite FeFe4(PO4)3(OH)5•2(H2O) C 2/c 2/m

42.09.01.03 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6•2(H2O) C 2/c 2/m

42.09.01.04 IMA2008-056! NaMnFe5(PO4)4(OH)6•2H2O C 2/c 2/m

42.09.01.05 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
16 - WWW-MINCRYST

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