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Hydrotungstite

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Formula:
WO2(OH)2 · H2O
System:
Monoclinic
Colour:
Dark green, ...
Hardness:
2
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 (Mohs):
2

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

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

Crystallography of Hydrotungstite

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

Relationship of Hydrotungstite to other Species

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

mindat.org URL:
https://www.mindat.org/min-1988.html
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.
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
      • Panasqueira
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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