Yttrotungstite-(Y) Mineral Data

Yttrotungstite-(Y) Mineral Data +

General Yttrotungstite-(Y) Information

Chemical Formula:

YW2O6(OH)3

Composition:

Molecular Weight = 603.62 gm

Yttrium 14.73 % Y 18.70 % Y₂O₃

Hydrogen 0.50 % H 4.48 % H₂O

Tungsten 60.92 % W 76.82 % WO₃

Oxygen 23.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

YW₂O₆(OH)₃

IMA Status:

Valid Species (Pre-IMA) 1950

Locality:

Kramat Pulai mine, Kinta District, Perak, Malaysia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Yttrium, Tungsten).

Yttrotungstite-(Y) Image

Images:

Yttrotungstite-(Y)

Comments: Orange crystals of Yttrotungstite-(Y).
Location: Kramat Pulai mine, Kinta, Perak, Malaysia. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Yttrotungstite-(Y) Crystallography

Axial Ratios:

a:b:c =0.8043:1:0.6678

Cell Dimensions:

a = 6.95, b = 8.64, c = 5.77, Z = 2; beta = 104.93° V = 334.78 Den(Calc)= 5.99

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.26(1), 4.69(1), 2.028(0.9),

Crystal Structure:

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Davis R J , Smith G W , Mineralogical Magazine , 38 (1971) p.261-285, Yttrotungstite, Locality: Kinta district, Perak, Malaysia

Physical Properties of Yttrotungstite-(Y)

Cleavage:

[???] Good

Color:

Canary yellow, Light yellow.

Density:

5.96

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

1 - Talc

Luster:

Earthy (Dull)

Streak:

yellow white

Optical Properties of Yttrotungstite-(Y)

Gladstone-Dale:

CI meas= 0.094 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1608,KPDmeas= 0.1616,KC= 0.1784

Optical Data:

Biaxial (-), a=1.89, b=1.98, g=2.02, bire=0.1300, 2V(Calc)=64, 2V(Meas)=68.

Pleochroism (x):

colorless or colorless.

Pleochroism (y):

colorless or colorless.

Pleochroism (z):

gray or canary yellow.

Calculated Properties of Yttrotungstite-(Y)

Electron Density:

r_electron=5.17 gm/cc
note: r_{Yttrotungstite-(Y)}=5.96 gm/cc.

Fermion Index

Fermion Index = 0.0871
Boson Index = 0.9129

Photoelectric:

PE_{Yttrotungstite-(Y)}= 777.08 barns/electron
U=PE_{Yttrotungstite-(Y)} x r_electron=4,020.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yttrotungstite-(Y) is Not Radioactive

Yttrotungstite-(Y) Classification

Dana Class:

49.3.3.2 (49)Basic and Hydrated Molybdates and Tungstates

(49.3)(Hydrated, containing Hydroxyl or Halogen)

(49.3.3)Dana Group

49.3.3.1 Cerotungstite-(Ce) CeW2O6(OH)3 P 2₁/m 2/m

49.3.3.2 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

49.3.3.3 Yttrotungstite-(Ce)! (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

Strunz Class:

IV/E.02-70 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 Yttrotungstite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Yttrotungstite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Print or Cut-and-Paste your Yttrotungstite-(Y) Specimen Label here :

Yttrotungstite-(Y)

YW2O6(OH)3
Dana No: 49.3.3.2 Strunz No: IV/E.02-70
Locality:

Notes: