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WO2(OH)2 · H2O
Dark green, ...
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 : 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

1 : Acid Hydrated Molybdates and Tungstates

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

Physical Properties of Hydrotungstite

Dark green, becoming yellowish on exposure to air
Hardness (Mohs):

Optical Data of Hydrotungstite

Biaxial (-)
RI values:
nα = 1.700 nβ = 1.950 nγ = 2.040
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
relatively strong

Chemical Properties of Hydrotungstite

IMA Formula:
WO2(OH)2 · H2O
Elements listed in formula:

Crystallography of Hydrotungstite

Crystal System:
Cell Parameters:
a = 7.45Å, b = 6.92Å, c = 3.72Å
β = 90.5°
a:b:c = 1.077 : 1 : 0.538
Unit Cell Volume:
V 191.77 ų (Calculated from Unit Cell)
Polysynthetic, may be grid-like
X-Ray Powder Diffraction Data:
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

Relationship of Hydrotungstite to other Species

4.FJ.05MeymaciteWO3 · 2H2O
4.FJ.05SidwilliteMoO3 · 2H2O
4.FJ.10TungstiteWO3 · H2O
4.FJ.15IlsemanniteMo3O8 · nH2O(?)
7.15.3SidwilliteMoO3 · 2H2O
7.15.4IlsemanniteMo3O8 · nH2O(?)
7.15.5TungstiteWO3 · H2O
7.15.7MeymaciteWO3 · 2H2O

Other Names for Hydrotungstite

Name in Other Languages:
Simplified Chinese:水钨华

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:
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 URL:
Please feel free to link to this page.

Localities for Hydrotungstite

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.
  • Tyrol
    • North Tyrol
      • Zillertal
        • Tux valley
          • Tux (Lanersbach; Lannersbach)
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
  • 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
  • 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.
  • 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
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German)
  • Honshu Island
    • Kinki Region
      • Kyoto Prefecture
        • Kameoka City
Matsuo et al (1981) Kyoto Chigakukaisha, 34, 6-43
  • Oppland
    • Lunner
      • Grua
        • Grua Mining District
Folvik, H. O. (2008): Nytt om mineraler. Tre nye mineraler fra Skjerpemyr, Grua. STEIN 35 (1): 16
  • 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
  • Castelo Branco District
    • Covilhã
      • Panasqueira
Bussink, R. W. (1984). Geochemistry of the Panasqueira tungsten-tin deposit, Portugal. Geologica Ultraiectina, 33, 1-170.
  • Western Province
    • Kabaya District
      • Sebeya river
Roy Kristiansen
  • Košice Region
    • Rožňava Co.
      • Ochtiná (Achten)
Martin Števko, unpublished-PXRD confirmed
  • Connecticut
    • Fairfield Co.
      • Trumbull
        • Long Hill
Jeremy Zolan
  • Nevada
    • Churchill Co.
      • Toy District
NBMG Spec. Pub. 31 Minerals of Nevada
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