Tungstite Mineral Data

General Tungstite Information

Chemical Formula:

WO3•(H2O)

Composition:

Molecular Weight = 249.86 gm

Hydrogen 0.81 % H 7.21 % H₂O

Tungsten 73.58 % W 92.79 % WO₃

Oxygen 25.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

WO₃•(H₂O)

Environment:

Secondary mineral derived from the alteration of tungsten minerals.

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Trubull, Connecticut. Link to MinDat.org Location Data.

Name Origin:

Named after its composition containig tungsen (Swedish, tung sten = "heavy stone").

Name Pronunciation:

Tungstite + Pronunciation

Synonym:

ICSD 201806

PDF 43-679

Tungstite Image

Images:

Tungstite

Comments: Yellow tungstite.
Location: San Antonio de Calacalani mine, Cercado, Oruro, Bolivia. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Tungstite Crystallography

Axial Ratios:

a:b:c =0.4977:1:0.4783

Cell Dimensions:

a = 5.328, b = 10.704, c = 5.12, Z = 4; V = 292.00 Den(Calc)= 5.68

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb

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

By Intensity(I/I_o): 3.49(1), 2.56(0.9), 2.68(0.9),

Physical Properties of Tungstite

Cleavage:

{001} Perfect, {???} Distinct

Color:

Yellow, Yellow green, Yellow green, Light yellow.

Density:

5.5

Diaphaneity:

Translucent to subtranslucent

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Magnetism:

Nonmagnetic

Streak:

yellow

Optical Properties of Tungstite

Gladstone-Dale:

CI meas= -0.188 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.15 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2107,KPDmeas= 0.2176,KC= 0.1832
Ncalc = 2.01 - 2.04

Optical Data:

Biaxial (-), a=2.09, b=2.24, g=2.26, bire=0.1700

Calculated Properties of Tungstite

Electron Density:

Bulk Density (Electron Density)=4.91 gm/cc
note: Specific Gravity of Tungstite =5.68 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Tungstite= 918.43 barns/electron
U=PE_Tungstite x rElectron Density=4,509.66 barns/cc.

Radioactivity:

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

Tungstite Classification

Dana Class:

04.05.02.01 (04)Simple Oxides

(04.05)with a cation charge of 6+ (A++++++ O3)

(04.05.02)Dana Group

04.05.02.01 Tungstite WO3•(H2O) Pmnb 2/m 2/m 2/m

Strunz Class:

04.FJ.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FJ -Hydroxides with H2O � (OH); corner-sharing octahedra

04.FJ.10 Tungstite WO3•(H2O) Pmnb 2/m 2/m 2/m

Other Tungstite Information

References:

NAME( Pough60) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Tungstite :
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
15 - WWW-MINCRYST

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

Tungstite

WO3•(H2O)
Dana No: 04.05.02.01 Strunz No: 04.FJ.10
Locality:

Notes:

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