Mineralogy Database

Hydrotungstite Mineral Data

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General Hydrotungstite Information

Help on Chemical  Formula: Chemical Formula: H2WO4•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: H2(WO4)•(H2O)
Help on Environment: Environment: An alteration product of ferberite in the oxidized zone of a hydrothermal tungsten deposit, where it was an ore mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1944
Help on Locality: Locality: Oruro district, at the San Antonio de Calacalani mine, near Colquiri, and in the Juliani mine, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its content of H2O and relation to tungstite.
Help on Name Pronunciation: Name Pronunciation: Hydrotungstite + Pronunciation Say HYDROTUNGSTITE

Hydrotungstite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0765:1:0.5375
Help on Cell Dimensions: Cell Dimensions: a = 7.45, b = 6.92, c = 3.72, Z = 2; beta = 90.5° V = 191.77 Den(Calc)= 4.64
Help on Crystal System: 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/Io): 6.96(1), 3.26(0.4), 3.31(0.4),

Physical Properties of Hydrotungstite

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Yellow green, Dark green.
Help on Density: Density: 4.6
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: greenish yellow

Optical Properties of Hydrotungstite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.09 gm/cc
note: Specific Gravity of Hydrotungstite =4.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEHydrotungstite = 840.62 barns/electron
U=PEHydrotungstite x rElectron Density=3,436.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hydrotungstite is Not Radioactive

Hydrotungstite Classification

Help on  Dana Class: Dana Class: (49)Basic and Hydrated Molybdates and Tungstates
  (49.01)(Acid Hydrated)
  (49.01.01)Dana Group Hydrotungstite H2WO4•(H2O) P 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 04.FJ.15





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