Xenotime-(Yb) Mineral Data

General Xenotime-(Yb) Information

Chemical Formula: YbPO4 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 Empirical Formula: Yb(PO₄) Environment: Found in the saccharoidal albite unit of a granitic pegmatite. Forms a series with xenotime-(Y). IMA Status: Approved IMA 1999 (Dana # Added) Locality: Shatford Lake pegmatite group, near the margin of the Lac du Bonnet batholith, southeastern Manitoba. Link to MinDat.org Location Data. Name Origin: Named after its composition and relationship with xenotime-(Y). Name Pronunciation: Xenotime-(Yb) Synonym: ICSD 79760   IMA1998-049   PDF 45-530  

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Xenotime-(Yb) Crystallography

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

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Crystal Structure:

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Ni Y , Hughes J M , Mariano A N , American Mineralogist , 80 (1995) p.21-26, Crystal chemistry of the monazite and xenotime structures, Yb(PO4)

 

Physical Properties of Xenotime-(Yb)

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

Optical Properties of Xenotime-(Yb)

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

Calculated Properties of Xenotime-(Yb)

Electron Density: Bulk Density (Electron Density)=2.74 gm/cc
note: Specific Gravity of Xenotime-(Yb) =3.14 gm/cc.
Fermion Index: Fermion Index = 0.19
Boson Index = 0.81 Photoelectric: PE_{Xenotime-(Yb)} = 657.13 barns/electron
U=PE_{Xenotime-(Yb)} x r_electron=1,801.53 barns/cc.
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

Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr 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

Dana Class: 38.04.11.06 (38)Anhydrous Phosphates, etc   (38.04)A+ XO4   (38.04.11)Zenotime Group (Tetragonal: I41/amd)  

38.04.11.01 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

 

38.04.11.02 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

 

38.04.11.03 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

 

38.04.11.04 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

 

38.04.11.05 Pretulite! ScPO4 I 4₁/amd 4/m 2/m 2/m

 

38.04.11.06 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

 

38.04.11.07 Wakefieldite-(La)! LaVO4 I 4₁/amd 4mm

 

38.04.11.08 Wakefieldite-(Nd)! NdVO4 I 4₁/amd 4mm

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

References: NAME( CanMin, 8/99) PHYS. PROP.(CanMin, 10/99) OPTIC PROP.(CanMin, 10/99) 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
11 - WWW-MINCRYST
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