Yftisite-(Y) Mineral Data

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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 - Approved IMA 1965

Locality:

Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

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

Name Pronunciation:

Yftisite-(Y)

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

Diaphaneity:

Transparent

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous - Greasy

Optical Properties of Yftisite-(Y)

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:

Bulk Density (Electron Density)=4.09 gm/cc
note: Specific Gravity of Yftisite-(Y) =4.47 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Yftisite-(Y)= 155.92 barns/electron
U=PE_Yftisite-(Y) x r_electron= 638.33 barns/cc.

Radioactivity:

GRapi = 10,663.23 (Gamma Ray American Petroleum Institute Units)
Concentration of Yftisite-(Y) per GRapi unit = 93.78 (PPM)

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 / 7.53 cm	244,488	6.61E-06	10,663.23	3.51
100 gm / 3.50 cm	24,449	6.61E-07	1,066.32	0.35
10 gm / 1.62 cm	2,445	6.61E-08	106.63	0.04
1 gm / 7.53 mm	244	6.61E-09	10.66	0.00
0.1 gm / 3.50 mm	24	6.61E-10	1.07	0.00
0.01 gm / 1.62 mm	2	6.61E-11	0.11	0.00
0.001 gm / 0.75 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 4.47 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:

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

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

(52.04.04)Natisite - Yftisite group

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

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

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

Strunz Class:

09.AG.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] ± [6] coordination

09.AG.25 Yftisite-(Y)? (Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6 C mcm 2/m 2/m 2/m

09.AG.25 Trimounsite-(Y) (Y,REE)2Ti2SiO9 P 2₁/c 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
11 - Ruff.Info

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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: 52.04.04.03 Strunz No: 09.AG.25
Locality:

Notes: