Hydrotungstite Mineral Data

General Hydrotungstite Information

Chemical Formula:

H2WO4•(H2O)

Composition:

Molecular Weight = 267.88 gm

Hydrogen 1.51 % H 13.45 % H₂O

Tungsten 68.63 % W 86.55 % WO₃

Oxygen 29.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

H₂(WO₄)•(H₂O)

Environment:

An alteration product of ferberite in the oxidized zone of a hydrothermal tungsten deposit, where it was an ore mineral.

IMA Status:

Valid Species (Pre-IMA) 1944

Locality:

Oruro district, at the San Antonio de Calacalani mine, near Colquiri, and in the Juliani mine, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for its content of H2O and relation to tungstite.

Name Pronunciation:

Hydrotungstite + Pronunciation

Hydrotungstite Image

Images:

Hydrotungstite

Comments: Bright yellow crystalline crusts of hydrotungstite on matrix.
Location: Colquiri Mine, Colquiri, La Paz, Bolivia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydrotungstite Crystallography

Axial Ratios:

a:b:c =1.0765:1:0.5375

Cell Dimensions:

a = 7.45, b = 6.92, c = 3.72, Z = 2; beta = 90.5° V = 191.77 Den(Calc)= 4.64

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/m

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

By Intensity(I/I_o): 6.96(1), 3.26(0.4), 3.31(0.4),

Physical Properties of Hydrotungstite

Cleavage:

{010} Indistinct

Color:

Yellow green, Dark green.

Density:

4.6

Hardness:

2 - Gypsum

Luster:

Vitreous - Dull

Streak:

greenish yellow

Optical Properties of Hydrotungstite

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1932,KPDmeas= 0.1949,KC= 0.1937
Ncalc = 1.89 - 1.9

Optical Data:

Biaxial (-), a=1.7, b=1.95, g=2.04, bire=0.3400, 2V(Calc)=54, 2V(Meas)=52.

Calculated Properties of Hydrotungstite

Electron Density:

Bulk Density (Electron Density)=4.09 gm/cc
note: Specific Gravity of Hydrotungstite =4.64 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_{Hydrotungstite}= 840.62 barns/electron
U=PE_{Hydrotungstite} x rElectron Density=3,436.32 barns/cc.

Radioactivity:

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

Hydrotungstite Classification

Dana Class:

49.01.01.01 (49)Basic and Hydrated Molybdates and Tungstates

(49.01)(Acid Hydrated)

(49.01.01)Dana Group

49.01.01.01 Hydrotungstite H2WO4•(H2O) P 2/m 2/m

Strunz Class:

04.FJ.15 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.15 Ilsemannite Mo3O8•n(H2O)(?) None

04.FJ.15 Hydrotungstite H2WO4•(H2O) P 2/m 2/m

Other Hydrotungstite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Hydrotungstite :
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

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Hydrotungstite

H2WO4•(H2O)
Dana No: 49.01.01.01 Strunz No: 04.FJ.15
Locality:

Notes:

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