Fluorthalenite-(Y) Mineral Data

General Fluorthalenite-(Y) Information

Chemical Formula:

Y3Si3O10F

Composition:

Molecular Weight = 529.97 gm

Yttrium 50.33 % Y 63.91 % Y₂O₃

Silicon 15.90 % Si 34.01 % SiO₂

Oxygen 30.19 % O

Fluorine 3.58 % F 3.58 % F

- % F -1.51 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Y₃Si₃O₁₀F

Environment:

"Amazonite" (microcline) pegmatites.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Ploskaya Mountain, western Keiv, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the F analog of thalenite-(Y).

Name Pronunciation:

Fluorthalenite-(Y) + Pronunciation

Synonym:

IMA1994-022

Fluorthalenite-(Y) Crystallography

Axial Ratios:

a:b:c =0.6575:1:0.9319

Cell Dimensions:

a = 7.321, b = 11.133, c = 10.375, Z = 4; beta = 97.166° V = 839.01 Den(Calc)= 4.20

Crystal System:

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

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

By Intensity(I/I_o): 3.12(1), 2.253(0.8), 2.828(0.8),

Physical Properties of Fluorthalenite-(Y)

Cleavage:

None

Color:

Colorless, White.

Density:

4.24

Diaphaneity:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Adamantine

Streak:

white

Optical Properties of Fluorthalenite-(Y)

Gladstone-Dale:

CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1751,KPDmeas= 0.1734,KC= 0.1811
Ncalc = 1.76 - 1.77

Optical Data:

Biaxial (-), a=1.719, b=1.739, g=1.748, bire=0.0290, 2V(Calc)=66, 2V(Meas)=73. Dispersion r < v moderate.

Calculated Properties of Fluorthalenite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Fluorthalenite-(Y) =4.20 gm/cc.

Fermion Index:

Fermion Index = 0.0075694898
Boson Index = 0.9924305102

Photoelectric:

PE_{Fluorthalenite-(Y)}= 63.76 barns/electron
U=PE_{Fluorthalenite-(Y)} x rElectron Density= 250.62 barns/cc.

Radioactivity:

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

Fluorthalenite-(Y) Classification

Dana Class:

55.02.01b.04 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.02)with cations in [6] coordination

(55.02.01b)Thortveitite related species

55.02.01b.01 Rowlandite-(Y) Y4FeSi4O14F2(?) None

55.02.01b.02 Thalenite-(Y) Y3Si3O10(OH) P 2₁/n 2/m

55.02.01b.03 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

55.02.01b.04 Fluorthalenite-(Y)! Y3Si3O10F P 2₁/m 2/m

Strunz Class:

09.BJ.20 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BJ -Sorosilicates with Si3O10, Si4O11, etc

09.BJ.20 Fluorthalenite-(Y)! Y3Si3O10F P 2₁/m 2/m

09.BJ.20 Thalenite-(Y) Y3Si3O10(OH) P 2₁/n 2/m

Other Fluorthalenite-(Y) Information

References:

NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p908,1998) OPTIC PROP.(AmMin)

See Also:

Links to other databases for Fluorthalenite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Fluorthalenite-(Y)

Y3Si3O10F
Dana No: 55.02.01b.04 Strunz No: 09.BJ.20
Locality:

Notes:

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