Mineralogy Database

Xenotime-(Yb) Mineral Data

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General Xenotime-(Yb) Information

Help on Chemical  Formula: Chemical Formula: YbPO4
Help on Composition: Composition: Molecular Weight = 268.01 gm
   Ytterbium   64.56 %  Yb   73.52 % Yb2O3
   Phosphorus  11.56 %  P    26.48 % P2O5
   Oxygen      23.88 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Yb(PO4)
Help on Environment: Environment: Found in the saccharoidal albite unit of a granitic pegmatite. Forms a series with xenotime-(Y).
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Shatford Lake pegmatite group, near the margin of the Lac du Bonnet batholith, southeastern Manitoba. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its composition and relationship with xenotime-(Y).
Help on Name Pronunciation: Name Pronunciation: Xenotime-(Yb) Say XENOTIME-(YB)
Help on Synonym: Synonym: ICSD 79760
  PDF 45-530

Xenotime-(Yb) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.87445
Help on Cell Dimensions: Cell Dimensions: a = 6.866, c = 6.004, Z = 2; V = 283.04 Den(Calc)= 3.14
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.44(1), 2.56(0.8), 4.52(0.7),1.76(0.5), 2.14(0.3), 2.73(0.3),
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Physical Properties of Xenotime-(Yb)

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, Yellowish white, Brownish white.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Xenotime-(Yb)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.968 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2416,KC= 0.1227
Ncalc = 1.39
Help on Optical Data: Optical Data: Uniaxial (+), w=1.715, e=1.802, bire=0.0870.

Calculated Properties of Xenotime-(Yb)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Xenotime-(Yb) =3.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.19
Boson Index = 0.81
Help on Photoelectric: Photoelectric: PEXenotime-(Yb) = 657.13 barns/electron
U=PEXenotime-(Yb) x relectron=1,801.53 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 60,129.09 (Gamma Ray American Petroleum Institute Units)
Concentration of Xenotime-(Yb) per GRapi unit = 16.63 (PPM)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 505.86 ±126.46 grams of pure Xenotime-(Yb) .

Estimated Radioactivity from Xenotime-(Yb) - weak
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 8.47 cm 1,446,243 3.91E-05 60,129.09 19.77
100 gm / 3.93 cm 144,624 3.91E-06 6,012.91 1.98
10 gm / 1.83 cm 14,462 3.91E-07 601.29 0.20
1 gm / 8.47 mm 1,446 3.91E-08 60.13 0.02
0.1 gm / 3.93 mm 145 3.91E-09 6.01 0.00
0.01 gm / 1.83 mm 14 3.91E-10 0.60 0.00
0.001 gm / 0.85 mm 1 3.91E-11 0.06 0.00

Weight of pure Xenotime-(Yb) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.14 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 ( 3.23 % Th) From Sum REE Elements (64.56 % REE)

Xenotime-(Yb) Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.11)Zenotime Group (Tetragonal: I41/amd) Xenotime-(Y) YPO4 I 41/amd 4/m 2/m 2/m Chernovite-(Y) YAsO4 I 41/amd 4/m 2/m 2/m Wakefieldite-(Y) YVO4 I 41/amd 4/m 2/m 2/m Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 41/amd 4/m 2/m 2/m Pretulite! ScPO4 I 41/amd 4/m 2/m 2/m Xenotime-(Yb)! YbPO4 I 41/amd 4/m 2/m 2/m Wakefieldite-(La)! LaVO4 I 41/amd 4mm Wakefieldite-(Nd)! NdVO4 I 41/amd 4mm
Help on  Strunz Class: Strunz Class: 08.AD.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
08.AD.35 Dreyerite BiVO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Chernovite-(Y) YAsO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Pretulite! ScPO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Xenotime-(Y) YPO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Wakefieldite-(Y) YVO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Xenotime-(Yb)! YbPO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Wakefieldite-(La)! LaVO4 I 41/amd 4mm
08.AD.35 Wakefieldite-(Nd)! NdVO4 I 41/amd 4mm

Other Xenotime-(Yb) Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(CanMin, 10/99) OPTIC PROP.(CanMin, 10/99)
Help on See Also: See Also: Links to other databases for Xenotime-(Yb) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.AD.35





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