Wolframoixiolite Mineral Data

Wolframoixiolite Mineral Data +

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General Wolframoixiolite Information

Chemical Formula:

(Fe,Mn,Nb)(Nb,W,Ta)O4

Composition:

Molecular Weight = 242.98 gm

Tantalum 7.45 % Ta 9.09 % Ta₂O₅

Manganese 6.78 % Mn 8.76 % MnO

Niobium 22.94 % Nb 32.82 % Nb₂O₅

Iron 13.79 % Fe 17.74 % FeO

Tungsten 22.70 % W 28.63 % WO₃

Oxygen 26.34 % O

______ ______

100.00 % 97.04 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.6Mn²⁺_0.3Nb_0.6W_0.3Ta_0.1O₄

IMA Status:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

Wolframoixiolite Image

Images:

Wolframoixiolite

Comments: Wolframoixiolite crystals in quartz.
Location: Zinnwald, Severocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wolframoixiolite Crystallography

Axial Ratios:

a:b:c =0.8239:1:0.8901

Cell Dimensions:

a = 4.674, b = 5.673, c = 5.05, Z = 2; beta = 90° V = 133.90 Den(Calc)= 6.03

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Pc

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

By Intensity(I/I_o): 2.963(1), 1.716(0.7), 3.641(0.7),

Physical Properties of Wolframoixiolite

Cleavage:

[???] Perfect

Color:

Black.

Density:

6.3 - 6.55, Average = 6.42

Diaphaniety:

Opaque

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Sub Metallic

Streak:

brownish black

Optical Properties of Wolframoixiolite

Optical Data:

NCalc= 2.21 - from Gladstone-Dale relationship (KC = 0.2012) where Ncalc=Dcalc*KC+1
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.2012) where Ncalc=Dmeas*KC+1

Calculated Properties of Wolframoixiolite

Electron Density:

r_electron=5.42 gm/cc
note: r_{Wolframoixiolite}=6.03 gm/cc.

Fermion Index

Fermion Index = 0.03547
Boson Index = 0.96453

Photoelectric:

PE_{Wolframoixiolite}= 400.22 barns/electron
U=PE_{Wolframoixiolite} x r_electron=2,169.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wolframoixiolite is Not Radioactive

Wolframoixiolite Classification

Dana Class:

4.0.0.0 (4)Oxide Minerals

(4.0)Without Dana Classification Numbers

(Oxide)

Strunz Class:

IV/D.16-40 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.16 - Wolframite series

IV/D.16-10 Hubnerite MnWO4 P 2/c 2/m

IV/D.16-20 Ferberite FeWO4 P 2/c 2/m

IV/D.16-30 Sanmartinite (Zn,Fe)WO4 P 2/c 2/m

IV/D.16-40 Wolframoixiolite (Fe,Mn,Nb)(Nb,W,Ta)O4 Pc m

Other Wolframoixiolite Information

References:

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

See Also:

Links to other databases for Wolframoixiolite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Translate Wolframoixiolite Mineral Data :

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Print or Cut-and-Paste your Wolframoixiolite Specimen Label here :

Wolframoixiolite

(Fe,Mn,Nb)(Nb,W,Ta)O4
Dana No: Unknown Strunz No: IV/D.16-40
Locality:

Notes: