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Hydrotungstite

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About HydrotungstiteHide

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 HydrotungstiteHide

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 HydrotungstiteHide

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

Optical Data of HydrotungstiteHide

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 HydrotungstiteHide

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

Crystallography of HydrotungstiteHide

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 DiffractionHide

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 HydrotungstiteHide

Synonyms of HydrotungstiteHide

Other Language Names for HydrotungstiteHide

Simplified Chinese:水钨华

Common AssociatesHide

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 GroupingHide

4.FJ.05MeymaciteWO3 · 2H2OAmor.
4.FJ.05SidwilliteMoO3 · 2H2OMon.
4.FJ.10TungstiteWO3 · H2OOrth.
4.FJ.15IlsemanniteMo3O8 · nH2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.15.1TugarinoviteMoO2Mon.
7.15.2MolybditeMoO3Orth.
7.15.3SidwilliteMoO3 · 2H2OMon.
7.15.4IlsemanniteMo3O8 · nH2O
7.15.5TungstiteWO3 · H2OOrth.
7.15.7MeymaciteWO3 · 2H2OAmor.
7.15.8Alumotungstite2W2O6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
7.15.9JixianitePb(W,Fe3+)2(O,OH)7Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

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 HydrotungstiteHide

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 HydrotungstiteHide

Localities for HydrotungstiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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)
Števko M., Sejkora J., Malíková R., Ozdín D., Gargulák M., Mikuš T., 2017: Supergénne minerály z kremeňovej žily s Mo-W mineralizáciou pri Ochtinej, Spišsko-gemerské rudohorie (Slovenská republika). Bull. Mineral. Petrolog., 25, 1, 43-54 (in Slovak with English abstract).
Ref.: Števko M., Sejkora J., Malíková R., Ozdín D., Gargulák M., Mikuš T. (2017): Supergénne minerály z kremeňovej žily s Mo-W mineralizáciou pri Ochtinej, Spišsko-gemerské rudohorie (Slovenská republika). Bull. Mineral. Petrolog., 25, 1, 43-54 (in Slovak with English abstract).
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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