Xenotime-(Yb) Mineral Data

Xenotime-(Yb) Mineral Data +

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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).

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

$Help on X Ray Diffraction:$ 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),

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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.

Diaphaniety:

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

Optical Data:

Uniaxial (+), w=1.715, e=1.802, bire=0.0870.

Calculated Properties of Xenotime-(Yb)

Electron Density:

r_electron=2.74 gm/cc
note: r_{Xenotime-(Yb)}=3.14 gm/cc.

Fermion Index

Fermion Index = 0.19703
Boson Index = 0.80297

Photoelectric:

PE_{Xenotime-(Yb)}= 657.13 barns/electron
U=PE_{Xenotime-(Yb)} x r_electron=1,801.53 barns/cc.

Radioactivity:

GRapi = 60,129.08 (Gamma Ray American Petroleum Institute Units)

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 Bequerols (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	60,129.08	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:

38.4.11.6 (38)Anhydrous Phosphates, etc

(38.4)A+ XO4

(38.4.11)Zenotime Group (Tetragonal: I41/amd)

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

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

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

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

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

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

Strunz Class:

VII/A.14-08 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre

VII/A.14 - Xenotime-(Y) - Wakefieldite-(Ce) series

VII/A.14-05 Pretulite! ScPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-08 Xenotime-(Yb) YbPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-10 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-20 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-25 Chernovite-(Ce)* (Ce,Y)(AsO4) I 4₁/amd 4/m 2/m 2/m

VII/A.14-30 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

VII/A.14-40 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 - WWW-MINCRYST

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Xenotime-(Yb)

YbPO4
Dana No: 38.4.11.6 Strunz No: VII/A.14-08
Locality:

Notes: