Hydrotungstite Mineral Data

Hydrotungstite Mineral Data +

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General Hydrotungstite Information

Chemical Formula:

H2WO4·(H2O)

Composition:

Molecular Weight = 267.88 gm

Hydrogen 1.51 % H 13.45 % H₂O

Tungsten 68.63 % W 86.55 % WO₃

Oxygen 29.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

H₂(WO₄)·(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1944

Locality:

Link to MinDat.org Location Data.

Hydrotungstite Image

Images:

Hydrotungstite

Comments: Bright yellow crystalline crusts of hydrotungstite on matrix.
Location: Colquiri Mine, Colquiri, La Paz, Bolivia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydrotungstite Crystallography

Axial Ratios:

a:b:c =1.0765:1:0.5375

Cell Dimensions:

a = 7.45, b = 6.92, c = 3.72, Z = 2; beta = 90.5° V = 191.77 Den(Calc)= 4.64

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.96(1), 3.26(0.4), 3.31(0.4),

Physical Properties of Hydrotungstite

Cleavage:

[010] Indistinct

Color:

Yellow green, Dark green.

Density:

4.6

Hardness:

2 - Gypsum

Luster:

Vitreous - Dull

Streak:

greenish yellow

Optical Properties of Hydrotungstite

Gladstone-Dale:

CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1932,KPDmeas= 0.1949,KC= 0.1937

Optical Data:

Biaxial (-), a=1.7, b=1.95, g=2.04, bire=0.3400, 2V(Calc)=54, 2V(Meas)=52.

Calculated Properties of Hydrotungstite

Electron Density:

r_electron=4.09 gm/cc
note: r_{Hydrotungstite}=4.64 gm/cc.

Fermion Index

Fermion Index = 0.09815
Boson Index = 0.90185

Photoelectric:

PE_{Hydrotungstite}= 840.62 barns/electron
U=PE_{Hydrotungstite} x r_electron=3,436.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hydrotungstite is Not Radioactive

Hydrotungstite Classification

Dana Class:

49.1.1.1 (49)Basic and Hydrated Molybdates and Tungstates

(49.1)(Acid Hydrated)

(49.1.1)Dana Group

49.1.1.1 Hydrotungstite H2WO4·(H2O) P 2/m 2/m

Strunz Class:

IV/E.02-30 IV - Oxides

IV/E - Oxides with metal : oxygen < 1:2 (M2O5, MO3)

IV/E.02 - Tungstite - Cerotungstite-(Ce) series

IV/E.02-10 Tungstite WO3·(H2O) Pmnb 2/m 2/m 2/m

IV/E.02-20 Meymacite WO3·2(H2O) None

IV/E.02-30 Hydrotungstite H2WO4·(H2O) P 2/m 2/m

IV/E.02-40 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic

IV/E.02-50 Anthoinite AlWO3(OH)3 P1 or P1 Tri

IV/E.02-60 Mpororoite Al(WO3)(OH)3·2(H2O) P1 or P1 Tri

IV/E.02-70 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

IV/E.02-75 Yttrotungstite-(Ce)! (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

IV/E.02-80 Cerotungstite-(Ce) CeW2O6(OH)3 P 2₁/m 2/m

Other Hydrotungstite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Hydrotungstite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Hydrotungstite Specimen Label here :

Hydrotungstite

H2WO4·(H2O)
Dana No: 49.1.1.1 Strunz No: IV/E.02-30
Locality:

Notes: