Yttrotungstite-(Y) Mineral Data

General Yttrotungstite-(Y) Information

Chemical Formula:

YW2O6(OH)3

Composition:

Molecular Weight = 598.35 gm

Calcium 0.27 % Ca 0.37 % CaO

La,Ce,Pr,Nd,Sm, 9.15 % RE 10.67 % REE₂O₃

Yttrium 8.17 % Y 10.38 % Y₂O₃

Magnesium 0.08 % Mg 0.13 % MgO

Aluminum 0.45 % Al 0.85 % Al₂O₃

Iron 0.28 % Fe 0.40 % Fe₂O₃

Silicon 0.19 % Si 0.40 % SiO₂

Hydrogen 0.51 % H 4.52 % H₂O

Tungsten 56.84 % W 71.68 % WO₃

Oxygen 24.07 % O

______ ______

100.00 % 99.41 % = TOTAL OXIDE

Empirical Formula:

Y_0.55REE_0.38Ca_0.04Mg_0.02W_1.85Al_0.1Si_0.04Fe³⁺_0.03O₆(OH)₃

Environment:

In eluvial cassiterite mines, probably altered from wolframite or scheelite

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).

Name Pronunciation:

Yttrotungstite-(Y) + Pronunciation

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 =0.8051:1:0.6681

Cell Dimensions:

a = 6.954, b = 8.637, c = 5.771, Z = 2; beta = 104.56° V = 335.48 Den(Calc)= 5.92

Crystal System:

Monoclinic - Prismatic H-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),

Physical Properties of Yttrotungstite-(Y)

Cleavage:

{010} Good, {101} Poor

Color:

Canary yellow, Light yellow.

Density:

5.96

Diaphaneity:

Semitransparent

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= 0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1627,KPDmeas= 0.1616,KC= 0.1744
Ncalc = 2.03 - 2.04

Optical Data:

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

Pleochroism (x):

colorless, colorless, or pale yellow.

Pleochroism (y):

colorless, colorless, or dark yellow.

Pleochroism (z):

gray, canary yellow, or dark yellow.

Calculated Properties of Yttrotungstite-(Y)

Electron Density:

Bulk Density (Electron Density)=5.15 gm/cc
note: Specific Gravity of Yttrotungstite-(Y) =5.92 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_{Yttrotungstite-(Y)}= 775.95 barns/electron
U=PE_{Yttrotungstite-(Y)} x r_electron=3,995.36 barns/cc.

Radioactivity:

GRapi = 8,514.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Yttrotungstite-(Y) per GRapi unit = 117.44 (PPM)

Yttrotungstite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Yttrotungstite-(Y)** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 6.86 cm	205,588	5.56E-06	8,514.92	2.80
100 gm / 3.18 cm	20,559	5.56E-07	851.49	0.28
10 gm / 1.48 cm	2,056	5.56E-08	85.15	0.03
1 gm / 6.86 mm	206	5.56E-09	8.51	0.00
0.1 gm / 3.18 mm	21	5.56E-10	0.85	0.00
0.01 gm / 1.48 mm	2	5.56E-11	0.09	0.00
0.001 gm / 0.69 mm	0	5.56E-12	0.01	0.00

Weight of pure Yttrotungstite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.92 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.46 % Th) From Sum REE Elements ( 9.15 % REE)

Yttrotungstite-(Y) Classification

Dana Class:

49.03.03.02 (49)Basic and Hydrated Molybdates and Tungstates

(49.03)(Hydrated, containing Hydroxyl or Halogen)

(49.03.03)Yttrotungstite Group

49.03.03.01 Cerotungstite-(Ce) (Ce,REE)W2O6(OH)3 P 2₁/m 2/m

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

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

Strunz Class:

04.FD.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra

04.FD.20 Cerotungstite-(Ce) (Ce,REE)W2O6(OH)3 P 2₁/m 2/m

04.FD.20 Yttrotungstite-(Ce)! (Ce,Nd,Y)W2O6(OH)3 P 2₁/m 2/m

04.FD.20 Yttrotungstite-(Y) YW2O6(OH)3 P 2₁/m 2/m

Other Yttrotungstite-(Y) Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(AntBidBlaNic5) OPTIC PROP.(AntBidBlaNic5)

See Also:

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

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Yttrotungstite-(Y)

YW2O6(OH)3
Dana No: 49.03.03.02 Strunz No: 04.FD.20
Locality:

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