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Hydrotungstite

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Big Photo

Lutsiro, Sebeya river, Kabaya District, Rwanda
© R.Kristiansen

Show Hydrotungstite Photos (2)



Formula:
WO
 
3
 · 2H
 
2
O
System:MonoclinicColour: 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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/E.02-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:49.1.1.1

49 : HYDRATED MOLYBDATES AND TUNGSTATES
1 : Acid Hydrated Molybdates and Tungstates
Hey's CIM Ref.:7.15.6

7 : Oxides and Hydroxides
15 : Oxides of Mo and W
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Type Occurrence of Hydrotungstite

Type Locality:San Antonio de Calacalani mine, Cercado Province, Oruro Department, Bolivia
Year of Discovery:1940

Physical Properties of Hydrotungstite

Colour: Dark green, becoming yellowish on exposure to air
Hardness (Mohs):2

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

Optical Data of Hydrotungstite

Type:Biaxial (-)
RI values: nα = 1.700 nβ = 1.950 nγ = 2.040
2V:Measured: 52° , Calculated: 54°
Maximum Birefringence:δ = 0.340

Chart 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:
WO
 
3
 · 2H
 
2
O
Essential elements:H, O, W
All elements listed in formula:H, O, W

Relationship of Hydrotungstite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FJ.05Meymacite
WO
 
3
 · 2H
 
2
O
4.FJ.05Sidwillite
MoO
 
3
 · 2H
 
2
O
4.FJ.10Tungstite
WO
 
3
 · H
 
2
O
4.FJ.15Ilsemannite
Mo
 
3
O
 
8
 · nH
 
2
O
4.FJ.20Parabariomicrolite
BaTa
 
4
O
 
10
(OH)
 
2
 · 2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
7.15.1Tugarinovite
MoO
 
2
7.15.2Molybdite
MoO
 
3
7.15.3Sidwillite
MoO
 
3
 · 2H
 
2
O
7.15.4Ilsemannite
Mo
 
3
O
 
8
 · nH
 
2
O
7.15.5Tungstite
WO
 
3
 · H
 
2
O
7.15.7Meymacite
WO
 
3
 · 2H
 
2
O
7.15.8Alumotungstite
7.15.9Jixianite
Pb(W,Fe
3+
 
)
 
2
(O,OH)
 
7

Other Names for Hydrotungstite

Synonyms:
Hydrotungstenite
Other Languages:
German:Hydrotungstit
Simplified Chinese:水钨华
Spanish:Hidrotungstita

Other Information

Health Warning: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

Search Engines:
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  • Look for Hydrotungstite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Hydrotungstite details from Handbook of Mineralogy (PDF)
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    • Localities for Hydrotungstite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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
     
    • Limousin
      • 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
    		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
          • Couto Mineiro da Panasqueira
    		No reference listed
    Rwanda
     
    • Kabaya District
      • Sebeya river
    		Roy Kristiansen
    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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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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