Xenotime-(Y) Mineral Data

Xenotime-(Y) Mineral Data +

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General Xenotime-(Y) Information

Chemical Formula:

YPO4

Composition:

Molecular Weight = 183.88 gm

Yttrium 48.35 % Y 61.40 % Y₂O₃

Phosphorus 16.84 % P 38.60 % P₂O₅

Oxygen 34.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Y(PO₄)

Environment:

Minor accessory mineral in both acidic and alkalic igneous rocks and their pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1832

Locality:

Hidra (Hitterø), Flekkefjord, Vest-Agder, Norway Link to MinDat.org Location Data.

Name Origin:

From the Greek xenos - "foreign" and time - "honor."

Synonym:

ICSD 79754

PDF 11-254

Xenotime-(Y) Image

Images:

Xenotime-(Y)

Comments: Dark brown colored Xenotime-(Y) crystal.
Location: Hurricane Mountain, Conway, Carroll County, New Hampshire, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Xenotime-(Y) Crystallography

Axial Ratios:

a:c = 1:0.87518

Cell Dimensions:

a = 6.89, c = 6.03, Z = 4; V = 286.26 Den(Calc)= 4.27

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): 3.45(1), 1.768(0.5), 2.56(0.5),

Forms:

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Forms: [ 1 0 0] [ 1 0 1]

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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

Physical Properties of Xenotime-(Y)

Cleavage:

[100] Perfect

Color:

Yellowish brown, Greenish brown, Gray, Reddish brown, Brown.

Density:

4.4 - 5.1, Average = 4.75

Diaphaniety:

Opaque

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

None.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Xenotime-(Y)

Dichroism (e):

pink, yellow, or yellow brown.

Dichroism (w):

brownish yellow, grayish brown, or greenish.

Gladstone-Dale:

CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.18,KPDmeas= 0.1618,KC= 0.175

Optical Data:

Uniaxial (+), w=1.721, e=1.816, bire=0.0950.

Calculated Properties of Xenotime-(Y)

Electron Density:

r_electron=3.99 gm/cc
note: r_Xenotime-(Y)=4.27 gm/cc.

Fermion Index

Fermion Index = 0.00016
Boson Index = 0.99984

Photoelectric:

PE_Xenotime-(Y)= 61.49 barns/electron
U=PE_Xenotime-(Y) x r_electron= 245.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Xenotime-(Y) is Not Radioactive

Xenotime-(Y) Classification

Dana Class:

38.4.11.1 (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.14-10 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-(Y) Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Xenotime-(Y)

YPO4
Dana No: 38.4.11.1 Strunz No: VII/A.14-10
Locality:

Notes: