Tungstite Mineral Data

Tungstite Mineral Data +

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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").

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 - DipyramidalH-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),

Crystal Structure:

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Szymanski J T , Roberts A C , The Canadian Mineralogist , 22 (1984) p.681-688, The crystal structure of tungstite, WO3.H2O

Physical Properties of Tungstite

Cleavage:

[001] Perfect, [???] Distinct

Color:

Yellow, Yellow green, Yellow green, Light yellow.

Density:

5.5

Diaphaniety:

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:

None.

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

Optical Data:

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

Calculated Properties of Tungstite

Electron Density:

r_electron=4.91 gm/cc
note: r_Tungstite=5.68 gm/cc.

Fermion Index

Fermion Index = 0.10519
Boson Index = 0.89481

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tungstite is Not Radioactive

Tungstite Classification

Dana Class:

4.5.2.1 (4)Simple Oxides

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

(4.5.2)Dana Group

4.5.2.1 Tungstite WO3·(H2O) Pmnb 2/m 2/m 2/m

Strunz Class:

IV/E.02-10 IV - Oxides

IV/E - Oxides with metal : oxygen < 1:2 (M2O5, MO3)

IV/E.02 - Tungstite - Cerotungstite-(Ce) series

IV/E.02-10 Tungstite WO3·(H2O) Pmnb 2/m 2/m 2/m

IV/E.02-20 Meymacite WO3·2(H2O) None

IV/E.02-30 Hydrotungstite H2WO4·(H2O) P 2/m 2/m

IV/E.02-40 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic

IV/E.02-50 Anthoinite AlWO3(OH)3 P1 or P1 Tri

IV/E.02-60 Mpororoite Al(WO3)(OH)3·2(H2O) P1 or P1 Tri

IV/E.02-70 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

IV/E.02-75 Yttrotungstite-(Ce)! (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

IV/E.02-80 Cerotungstite-(Ce) CeW2O6(OH)3 P 2₁/m 2/m

Other Tungstite Information

References:

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

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Tungstite

WO3·(H2O)
Dana No: 4.5.2.1 Strunz No: IV/E.02-10
Locality:

Notes: