Yttrialite-(Y) Mineral Data

Yttrialite-(Y) Mineral Data +

General Yttrialite-(Y) Information

Chemical Formula:

(Y,Th)2Si2O7

Composition:

Molecular Weight = 417.54 gm

Yttrium 31.94 % Y 40.56 % Y₂O₃

Thorium 27.79 % Th 31.62 % ThO₂

Silicon 13.45 % Si 28.78 % SiO₂

Oxygen 26.82 % O

______ ______

100.00 % 100.96 % = TOTAL OXIDE

Empirical Formula:

Y_1.5Th_0.5Si₂O₇

Environment:

Associated with gadolinite.

IMA Status:

Valid Species (Pre-IMA) 1889

Locality:

Llano Co., Texas, USA. Link to MinDat.org Location Data.

Synonym:

ICSD 28004

PDF 24-1427

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Yttrialite-(Y) Crystallography

Axial Ratios:

a:b:c =0.9106:1:0.6228

Cell Dimensions:

a = 7.34, b = 8.06, c = 5.02, Z = 2; beta = 108.5° V = 281.64 Den(Calc)= 4.92

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

Crystal Structure:

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Batalieva N G , Pyatenko Yu A , Kristallografiya , 16 (1971) p.905-910, Artificial yttrialite (gamma-phase) - a representative of a, new structure type in the rare earth diorthosilicate series

Physical Properties of Yttrialite-(Y)

Cleavage:

None

Color:

Green, Orangish yellow.

Density:

4.58

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5-5.5 - Apatite-Knife Blade

Luminescence:

Non-fluorescent.

Optical Properties of Yttrialite-(Y)

Gladstone-Dale:

CI meas= 0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.152 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1541,KPDmeas= 0.1655,KC= 0.1816

Optical Data:

Isotropic, n=1.758.

Calculated Properties of Yttrialite-(Y)

Electron Density:

r_electron=4.11 gm/cc
note: r_{Yttrialite-(Y)}=4.58 gm/cc.

Fermion Index

Fermion Index = 0.00641
Boson Index = 0.99359

Photoelectric:

PE_{Yttrialite-(Y)}= 693.08 barns/electron
U=PE_{Yttrialite-(Y)} x r_electron=2,850.86 barns/cc.

Radioactivity:

GRapi = 532,369.72 (Gamma Ray American Petroleum Institute Units)

Yttrialite-(Y) 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) 57.13 ± 14.28 grams of pure Yttrialite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5713.4 ±1428.4 grams of pure Yttrialite-(Y) .

**Estimated Radioactivity from Yttrialite-(Y)** - strong
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 / 7.47 cm	12,448,137	3.36E-04	532,369.72	175.03
100 gm / 3.47 cm	1,244,814	3.36E-05	53,236.97	17.50
10 gm / 1.61 cm	124,481	3.36E-06	5,323.70	1.75
1 gm / 7.47 mm	12,448	3.36E-07	532.37	0.18
0.1 gm / 3.47 mm	1,245	3.36E-08	53.24	0.02
0.01 gm / 1.61 mm	124	3.36E-09	5.32	0.00
0.001 gm / 0.75 mm	12	3.36E-10	0.53	0.00

Weight of pure Yttrialite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.58 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

Yttrialite-(Y) Classification

Dana Class:

55.2.1b.3 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.2)with cations in [6] coordination

(55.2.1b)Thortveitite related species

55.2.1b.1 Rowlandite-(Y) Y4FeSi4O14F2(?) None

55.2.1b.2 Thalenite-(Y) Y3Si3O10(OH) P 2₁/n 2/m

55.2.1b.3 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

55.2.1b.4 Fluorthalenite-(Y)! Y3Si3O10F P 2₁/m 2/m

Strunz Class:

VIII/C.01-40 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.01 - Thortveitite - Rowlandite-(Y) series

VIII/C.01-10 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m

VIII/C.01-15 Gittinsite CaZrSi2O7 C 2/m 2/m

VIII/C.01-18 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

VIII/C.01-20 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m

VIII/C.01-30 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m

VIII/C.01-40 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

VIII/C.01-45 Percleveite-(Ce)! (Ce,La,Nd)2Si2O7 P 4₁ 4

VIII/C.01-50 Rowlandite-(Y) Y4FeSi4O14F2(?) None

Other Yttrialite-(Y) Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Yttrialite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Yttrialite-(Y)

(Y,Th)2Si2O7
Dana No: 55.2.1b.3 Strunz No: VIII/C.01-40
Locality:

Notes: