Yftisite-(Y) Mineral Data

Yftisite-(Y) Mineral Data +

General Yftisite-(Y) Information

Chemical Formula:

(Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6

Composition:

Molecular Weight = 753.13 gm

Dysprosium 6.47 % Dy 7.43 % Dy₂O₃

Yttrium 41.32 % Y 52.47 % Y₂O₃

Erbium 4.44 % Er 5.08 % Er₂O₃

Titanium 4.77 % Ti 7.95 % TiO₂

Silicon 7.46 % Si 15.96 % SiO₂

Tin 3.94 % Sn 5.00 % SnO₂

Hydrogen 0.27 % H 2.39 % H₂O

Oxygen 21.24 % O

Fluorine 10.09 % F 10.09 % F

- % F -4.25 % -O=F₂

______ ______

100.00 % 102.12 % = TOTAL OXIDE

Empirical Formula:

Y_3.5Dy_0.3Er_0.2Ti_0.75Sn_0.25(SiO₄)₂F₄(OH)₂

Environment:

Silicified alkalic granite near a gabbro-anothosite contact. Approved 1965, discredited 1987 as incompletly characterized.

IMA Status:

Discredited IMA 1987

Locality:

Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named in 1965 for the elemental makeup, (Y, F, Ti, Si).

Synonym:

Discredited IMA 1997

ICSD 20003

PDF 33-1462

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Yftisite-(Y) Crystallography

Axial Ratios:

a:b:c =1.4068:1:0.6628

Cell Dimensions:

a = 14.949, b = 10.626, c = 7.043, Z = 4; V = 1,118.77 Den(Calc)= 4.47

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mcm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.766(1), 2.667(1), 3.099(1),

Crystal Structure:

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Balko V P , Bakakin V V , Zhurnal Strukturnoi Khimii , 16 (1975) p.837-842, Crystal-structure of natural yttrium and rare-earth fluorotitano-silicate, (Y,Ree)4(F,OH)6TiO[SiO4]2 (yftisite)

Physical Properties of Yftisite-(Y)

Cleavage:

None

Color:

Yellow.

Density:

3.96

Diaphaniety:

Transparent

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous - Greasy

Optical Properties of Yftisite-(Y)

Gladstone-Dale:

CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.163 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.157,KPDmeas= 0.1773,KC= 0.1877

Optical Data:

Biaxial (-), a=1.69, b=1.705, g=1.711, bire=0.0210, 2V(Calc)=64, 2V(Meas)=large. Dispersion r > v distinct.

Pleochroism (x):

anomalous blue.

Pleochroism (y):

anomalous blue.

Pleochroism (z):

anomalous blue.

Calculated Properties of Yftisite-(Y)

Electron Density:

r_electron=3.63 gm/cc
note: r_Yftisite-(Y)=3.96 gm/cc.

Fermion Index

Fermion Index = 0.05484
Boson Index = 0.94516

Photoelectric:

PE_Yftisite-(Y)= 155.92 barns/electron
U=PE_Yftisite-(Y) x r_electron= 565.50 barns/cc.

Radioactivity:

GRapi = 10,663.23 (Gamma Ray American Petroleum Institute Units)

Yftisite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Yftisite-(Y)** - 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 / 7.84 cm	244,488	6.61E-06	10,663.23	3.51
100 gm / 3.64 cm	24,449	6.61E-07	1,066.32	0.35
10 gm / 1.69 cm	2,445	6.61E-08	106.63	0.04
1 gm / 7.84 mm	244	6.61E-09	10.66	0.00
0.1 gm / 3.64 mm	24	6.61E-10	1.07	0.00
0.01 gm / 1.69 mm	2	6.61E-11	0.11	0.00
0.001 gm / 0.78 mm	0	6.61E-12	0.01	0.00

Weight of pure Yftisite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.96 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 ( 0.55 % Th) From Sum REE Elements (10.91 % REE)

Yftisite-(Y) Classification

Dana Class:

52.4.4.3 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.4)Natisite - Yftisite group

52.4.4.1 Natisite Na2(TiO)SiO4 P 4/nmm 4/m 2/m 2/m

52.4.4.2 Paranatisite Na2[TiO(SiO4)] P mc2₁ mm2

52.4.4.3 Yftisite-(Y) ? (Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6 C mcm 2/m 2/m 2/m

Strunz Class:

VIII/B.14-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.14 - Yftisite-(Y) ? series

VIII/B.14-10 Yftisite-(Y) (Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6 C mcm 2/m 2/m 2/m

Other Yftisite-(Y) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

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

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Print or Cut-and-Paste your Yftisite-(Y) Specimen Label here :

Yftisite-(Y)

(Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6
Dana No: 52.4.4.3 Strunz No: VIII/B.14-10
Locality:

Notes: