Wolframoixiolite Mineral Data

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

Environment:

Now considered to be ixiolite.

IMA Status:

Not Approved IMA 1996 - Published 1969

Locality:

Unknown locality, China. Link to MinDat.org Location Data.

Name Origin:

Named for its composition and structure, which show similarities to both wolframite and ixiolite.

Name Pronunciation:

Wolframoixiolite + Pronunciation

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, {???} Fair

Color:

Black.

Density:

6.55

Diaphaneity:

Opaque

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Highly Radioactive.

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= 2.32 - from Gladstone-Dale relationship (KC = 0.2012) where Ncalc=Dmeas*KC+1

RL Color:

Gray with a reddish brown tint.

Calculated Properties of Wolframoixiolite

Electron Density:

Bulk Density (Electron Density)=5.42 gm/cc
note: Specific Gravity of Wolframoixiolite =6.03 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

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

Radioactivity:

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

Wolframoixiolite Classification

Dana Class:

04.00.00.00 (04)Oxide Minerals

(04.00)Without Dana Classification Numbers

(04.00.00)Oxide

04.00.00.00 Ashanite? (Nb,Ta,U,Fe,Mn)4O8 Pcan 2/m 2/m 2/m

04.00.00.00 Chubutite* Pb7O6Cl2 Unk Ortho

04.00.00.00 Clinobirnessite* Na4Mn14O27•9(H2O) Mono

04.00.00.00 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m

04.00.00.00 IMA2008-022 UO2(OH)2 pseudo-orthorhombic Mono

04.00.00.00 Krasnogorite* WO3 Pmnb 2/m 2/m 2/m

04.00.00.00 Mengxianminite* (Ca,Na)3(Fe,Mn)2Mg2(Sn,Zn)5Al8O29 Unk Ortho

04.00.00.00 Romanite* (Fe,U,Pb)2(Ti,Fe)O4 Trig ? Trig

04.00.00.00 Tantalowodginite* (Mn2,[])4Ta4Ta8O32 C 2/c 2/m

04.00.00.00 Ungursaite* NaCa5(Ta,Nb)24O65(OH) P 6₃/m,P 6₃ Hex

04.00.00.00 Wolframoixiolite* (Fe,Mn,Nb)(Nb,W,Ta)O4 Pc m

Strunz Class:

04.DB.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DB -With medium-sized cations; chains of edge-sharing octahedra

04.DB.30 Ferberite FeWO4 P 2/c 2/m

04.DB.30 Hubnerite MnWO4 P 2/c 2/m

04.DB.30 Krasnoselskite* CoWO4 P 2/c 2/m

04.DB.30 Sanmartinite (Zn,Fe)WO4 P 2/c 2/m

04.DB.30 Wolframoixiolite* (Fe,Mn,Nb)(Nb,W,Ta)O4 Pc m

04.DB.30 Wolframite* (Fe,Mn)WO4 P 2/c 2/m

04.DB.30 Heftetjernite! ScTaO4 P 2/c 2/m

Other Wolframoixiolite Information

References:

NAME( AmMin, v55:318) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AmMin, v55:318)

See Also:

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

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

Wolframoixiolite

(Fe,Mn,Nb)(Nb,W,Ta)O4
Dana No: 04.00.00.00 Strunz No: 04.DB.30
Locality:

Notes: