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Hydrotungstite

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Formula:
WO3 · 2H2O
Colour:
Dark green, becoming yellowish on exposure to air
Hardness:
2
Crystal System:
Monoclinic
Hydrotungstite is unstable and dehydrates to tungstite, so most specimens in systematic species collections are no longer hydrotungstite.


Classification of Hydrotungstite

Approved, 'Grandfathered' (first described prior to 1959)
4.FJ.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
J : Hydroxides with H2O +- (OH); corner-sharing octahedra
49.1.1.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
1 : Acid Hydrated Molybdates and Tungstates
7.15.6

7 : Oxides and Hydroxides
15 : Oxides of Mo and W

Physical Properties of Hydrotungstite

Colour:
Dark green, becoming yellowish on exposure to air
Hardness:

Optical Data of Hydrotungstite

Type:
Biaxial (-)
RI values:
nα = 1.700 nβ = 1.950 nγ = 2.040
2V:
Measured: 52° , Calculated: 54°
Max Birefringence:
δ = 0.340
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively strong

Chemical Properties of Hydrotungstite

Formula:
WO3 · 2H2O
IMA Formula:
WO2(OH)2 · H2O

Crystallography of Hydrotungstite

Crystal System:
Monoclinic
Cell Parameters:
a = 7.45 Å, b = 6.92 Å, c = 3.72 Å
β = 90.5°
Ratio:
a:b:c = 1.077 : 1 : 0.538
Unit Cell V:
191.77 ų (Calculated from Unit Cell)
Twinning:
Polysynthetic, may be grid-like

X-Ray Powder Diffraction

Powder Diffraction Data:
d-spacingIntensity
6.95 (vvs)
3.73 (s)
3.46 (ms)
3.27 (vs)
2.63 (m)
2.54 (m)
1.96 (ms)

Type Occurrence of Hydrotungstite

Synonyms of Hydrotungstite

Other Language Names for Hydrotungstite

Simplified Chinese:水钨华

Common Associates

Associated Minerals Based on Photo Data:
Ferberite6 photos of Hydrotungstite associated with Ferberite on mindat.org.
Tungstite5 photos of Hydrotungstite associated with Tungstite on mindat.org.
Cuprotungstite1 photo of Hydrotungstite associated with Cuprotungstite on mindat.org.
Hübnerite1 photo of Hydrotungstite associated with Hübnerite on mindat.org.
Quartz1 photo of Hydrotungstite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz Grouping

4.FJ.05MeymaciteWO3 · 2H2O
4.FJ.05SidwilliteMoO3 · 2H2O
4.FJ.10TungstiteWO3 · H2O
4.FJ.15IlsemanniteMo3O8 · nH2O

Related Minerals - Hey's Chemical Index of Minerals Grouping

7.15.1TugarinoviteMoO2
7.15.2MolybditeMoO3
7.15.3SidwilliteMoO3 · 2H2O
7.15.4IlsemanniteMo3O8 · nH2O
7.15.5TungstiteWO3 · H2O
7.15.7MeymaciteWO3 · 2H2O
7.15.8Alumotungstite2W2O6(H2O)
7.15.9JixianitePb(W,Fe3+)2(O,OH)7

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Hydrotungstite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 29: 192-210.
Mineralogical Record (1981): 12: 81-85.
Kaduc, J. A. & Sentmann, J. B. (2008): Crystal structure of synthetic hydrotungstite, WO2(OH)2(H2O). Acta Crystallogr. A64, C545. [Poster abstract]

Internet Links for Hydrotungstite

mindat.org URL:
https://www.mindat.org/min-1988.html
Please feel free to link to this page.

Localities for Hydrotungstite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Austria
 
  • Tyrol
    • North Tyrol
      • Zillertal
        • Tux valley
          • Tux (Lanersbach; Lannersbach)
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
Bolivia
 
  • Oruro Department
    • Cercado Province
      • Condeauque District (Conde Auque)
Kempff, O., Paar, W.H., Tawackoli, S.: "Minerales de Bolivia", 115pp (La Paz, 2009)
Amer. Mineral. (1944) 29, 192–210
Canada
 
  • Nova Scotia
    • Inverness Co.
A.K. Chatterjee, "Tungsten Mineralization in the Carbonate Rocks of the George River Group, Cape Breton Island, Nova Scotia", Nova Scotia Dept. Mines, Report 77-7, 1977.
France
 
  • Nouvelle-Aquitaine
    • Corrèze
      • Meymac
Ansermet, S., Cuchet, S. & Meisser, N. (2010): Minéralogie de la mine de La grange, Meymac, Corrèze. Le Règne Minéral, 91: 23-31
    • Haute-Vienne
      • Nantiat
        • Vaulry
          • Vaulry Mines
Patrice Queneau Collection
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
Japan
 
  • Honshu Island
    • Kinki Region
      • Kyoto Prefecture
        • Kameoka City
Matsuo et al (1981) Kyoto Chigakukaisha, 34, 6-43
Norway
 
  • Oppland
    • Lunner
      • Grua
        • Grua Mining District
Folvik, H. O. (2008): Nytt om mineraler. Tre nye mineraler fra Skjerpemyr, Grua. STEIN 35 (1): 16
Peru
 
  • La Libertad Department
    • Sanchez Carrion Province
      • Huamachuco
        • Mundo Nuevo
Hyršl, J. (2011): Pasto Bueno und Mundo Nuevo in Peru- die weltbesten Hübnerite und mehr. Mineralien Welt 22(1), 64-79
Hyršl, J. (2011): Pasto Bueno und Mundo Nuevo in Peru- die weltbesten Hübnerite und mehr. Mineralien Welt 22(1), 64-79
Portugal
 
  • Castelo Branco District
    • Covilhã
Bussink, R. W. (1984). Geochemistry of the Panasqueira tungsten-tin deposit, Portugal. Geologica Ultraiectina, 33, 1-170.
Rwanda
 
  • Western Province
    • Kabaya District
      • Sebeya river
Roy Kristiansen
Slovakia
 
  • Košice Region
    • Rožňava Co.
      • Ochtiná (Achten)
Martin Števko, unpublished-PXRD confirmed
USA
 
  • Connecticut
    • Fairfield Co.
      • Trumbull
        • Long Hill
Jeremy Zolan
  • Nevada
    • Churchill Co.
      • Toy District
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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