Natrodufrenite Mineral Data

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General Natrodufrenite Information

Chemical Formula:

Na(Fe+++,Fe++)(Fe+++,Al)5(PO4)4(OH)6•2(H2O)

Composition:

Molecular Weight = 786.50 gm

Sodium 1.75 % Na 2.36 % Na₂O

Aluminum 3.09 % Al 5.83 % Al₂O₃

Iron 34.44 % Fe 0.46 % FeO / 48.73 % Fe₂O₃

Phosphorus 14.97 % P 34.29 % P₂O₅

Hydrogen 1.20 % H 10.77 % H₂O

Oxygen 44.55 % O

______ ______

100.00 % 102.44 % = TOTAL OXIDE

Empirical Formula:

Na_0.6Fe³⁺_0.7Fe²⁺_0.05Fe³⁺_4.1Al_0.9(PO₄)_3.8(OH)₄(H₂O)_2.7

Environment:

Low-temperature secondary mineral.

IMA Status:

Approved IMA 1982

Locality:

Rochefort-en-Terre, Morbihan, France. Link to MinDat.org Location Data.

Name Origin:

Named for the essential sodium, (NATRium) and its relationship to dufrenite.

Name Pronunciation:

Natrodufrenite + Pronunciation

Natrodufrenite Image

Images:

Natrodufrenite

Comments: Greenish gray, botryoidal aggregates natrodufrenite on hematite-stained quartz.
Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Natrodufrenite Crystallography

Axial Ratios:

a:b:c =5.0155:1:2.6644

Cell Dimensions:

a = 25.83, b = 5.15, c = 13.722, Z = 4; beta = 111.533° V = 1,697.96 Den(Calc)= 3.08

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): 3.152(1), 3.4(0.8), 12.04(0.8),

Physical Properties of Natrodufrenite

Color:

Light blue green.

Density:

3.23

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3.5-4.5 - Between Copper Penny and Fluorite-Apatite

Luster:

Silky

Streak:

green

Optical Properties of Natrodufrenite

Gladstone-Dale:

CI meas= 0.123 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2485,KPDmeas= 0.237,KC= 0.2703
Ncalc = 1.83 - 1.87

Optical Data:

Biaxial (?), a=1.756, g=1.775, bire=0.0190

Pleochroism (x):

pale yellow.

Pleochroism (z):

dark green.

Calculated Properties of Natrodufrenite

Electron Density:

Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Natrodufrenite =3.08 gm/cc.

Fermion Index:

Fermion Index = 0.0075166155
Boson Index = 0.9924833845

Photoelectric:

PE_{Natrodufrenite}= 11.07 barns/electron
U=PE_{Natrodufrenite} x rElectron Density= 33.48 barns/cc.

Radioactivity:

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

Natrodufrenite Classification

Dana Class:

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

(42.09)where (A)3 (XO4)2 Zq · 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

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 Natrodufrenite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Natrodufrenite :
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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Natrodufrenite

Na(Fe+++,Fe++)(Fe+++,Al)5(PO4)4(OH)6•2(H2O)
Dana No: 42.09.01.03 Strunz No: 08.DK.15
Locality:

Notes: