Xenotime-(Y) Mineral Data

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TIMA, a fully automated, high throughput, analytical scanning electron microscope is designed specifically for the mining and minerals processing industry. The TIMA solution will address applications such as Mineral Liberation Analysis and others.

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."

Name Pronunciation:

Xenotime-(Y)

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

Diaphaneity:

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:

Non-fluorescent.

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
Ncalc = 1.75 - 1.89

Optical Data:

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

Calculated Properties of Xenotime-(Y)

Electron Density:

Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Xenotime-(Y) =4.27 gm/cc.

Fermion Index:

Fermion Index = 0.0001670617
Boson Index = 0.9998329383

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Xenotime-(Y) is Not Radioactive

Xenotime-(Y) Classification

Dana Class:

38.04.11.01 (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-(Y) Information

References:

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

See Also:

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

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Ask about Xenotime-(Y) here :
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Print or Cut-and-Paste your Xenotime-(Y) Specimen Label here :

Xenotime-(Y)

YPO4
Dana No: 38.04.11.01 Strunz No: 08.AD.35
Locality:

Notes: