Wolframite Mineral Data

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General Wolframite Information

Chemical Formula:

(Fe,Mn)WO4

Composition:

Molecular Weight = 303.24 gm

Manganese 9.06 % Mn 11.70 % MnO

Iron 9.21 % Fe 11.85 % FeO

Tungsten 60.63 % W 76.46 % WO₃

Oxygen 21.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.5Mn²⁺_0.5(WO₄)

Environment:

Group name for the hübnerite - ferberite series.

IMA Status:

Not Approved IMA 1863

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the German, Wolfram, name for tungsten.

Name Pronunciation:

Wolframite + Pronunciation

Synonym:

ICSD 15192

PDF 12-727

Wolframite Image

Images:

Wolframite

Comments: Dark gray, tabular crystals of wolframite to 2 cm. Carsten Sukatsch collection.
Location: Kara-Oba, Republic of Kazakstan. Scale: Picture size 3 cm.
© Willibald Büdel

Wolframite Crystallography

Axial Ratios:

a:b:c =0.8324:1:0.8691

Cell Dimensions:

a = 4.77, b = 5.73, c = 4.98, Z = 2; beta = 90° V = 136.11 Den(Calc)= 7.40

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/c

Forms:

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Forms: ( 1 1 0) ( 1 0 0) ( 0 1 1) ( 1 0 2)

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Crystal Structure:

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Escobar C , Cid-Dresdner H , Kittl P , Dumler I , American Mineralogist , 56 (1971) p.489-498, The relation between light wolframite and common wolframite, sample: light wolframite

View Additional jPOWD Structure files for Wolframite
[1]

Physical Properties of Wolframite

Cleavage:

{010} Perfect

Color:

Brownish black, Iron black.

Density:

7.1 - 7.5, Average = 7.3

Diaphaneity:

Opaque

Fracture:

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

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

reddish brown

Optical Properties of Wolframite

Optical Data:

NCalc= 2.3 - from Gladstone-Dale relationship (KC = 0.1761) where Ncalc=Dcalc*KC+1
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.1761) where Ncalc=Dmeas*KC+1

Calculated Properties of Wolframite

Electron Density:

Bulk Density (Electron Density)=6.42 gm/cc
note: Specific Gravity of Wolframite =7.40 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Wolframite= 759.93 barns/electron
U=PE_Wolframite x rElectron Density=4,877.22 barns/cc.

Radioactivity:

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

Wolframite Classification

Dana Class:

48.01.01.00 (48)Anhydrous Molybdates and Tungstates

(48.01)where A XO4

(48.01.01)Wolframite series

48.01.01.00 Wolframite* (Fe,Mn)WO4 P 2/c 2/m

48.01.01.01 Hubnerite MnWO4 P 2/c 2/m

48.01.01.02 Ferberite FeWO4 P 2/c 2/m

48.01.01.03 Sanmartinite (Zn,Fe)WO4 P 2/c 2/m

48.01.01.04 Heftetjernite! ScTaO4 P 2/c 2/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 Wolframite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Mason68)

See Also:

Links to other databases for Wolframite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - GeoScienceWorld
6 - Glendale Community College
7 - Google Images
8 - Google Scholar
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - Philatelic Mineralogy
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Scandinavian mineral gallery
16 - University of Colorado - Mineral Structure Data
17 - WWW-MINCRYST
18 - YupRocks

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

Wolframite

(Fe,Mn)WO4
Dana No: 48.01.01.00 Strunz No: 04.DB.30
Locality:

Notes: