Natrodufrenite Mineral Data

Natrodufrenite Mineral Data +

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.

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

Diaphaniety:

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= 0.12 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2485,KPDmeas= 0.237,KC= 0.2694

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:

r_electron=3.02 gm/cc
note: r_{Natrodufrenite}=3.08 gm/cc.

Fermion Index

Fermion Index = 0.00751
Boson Index = 0.99249

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natrodufrenite is Not Radioactive

Natrodufrenite Classification

Dana Class:

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

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.1)Dana Group

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

42.9.1.2 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

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

Strunz Class:

VII/D.11-130 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Natrodufrenite

Na(Fe+++,Fe++)(Fe+++,Al)5(PO4)4(OH)6·2(H2O)
Dana No: 42.9.1.3 Strunz No: VII/D.11-130
Locality:

Notes: