Mineralogy Database

Fluorthalenite-(Y) Mineral Data

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General Fluorthalenite-(Y) Information

Help on Chemical  Formula: Chemical Formula: Y3Si3O10F
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Y3Si3O10F
Help on Environment: Environment: "Amazonite" (microcline) pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Ploskaya Mountain, western Keiv, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the F analog of thalenite-(Y).
Help on Name Pronunciation: Name Pronunciation: Fluorthalenite-(Y) + Pronunciation Say FLUORTHALENITE-(Y)
Help on Synonym: Synonym: IMA1994-022

Fluorthalenite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6575:1:0.9319
Help on Cell Dimensions: Cell Dimensions: a = 7.321, b = 11.133, c = 10.375, Z = 4; beta = 97.166° V = 839.01 Den(Calc)= 4.20
Help on Crystal System: 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/Io): 3.12(1), 2.253(0.8), 2.828(0.8),

Physical Properties of Fluorthalenite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 4.24
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Fluorthalenite-(Y)

Help on Gladstone-Dale: 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
Help on Optical Data: 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)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Fluorthalenite-(Y) =4.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0075694898
Boson Index = 0.9924305102
Help on Photoelectric: Photoelectric: PEFluorthalenite-(Y) = 63.76 barns/electron
U=PEFluorthalenite-(Y) x rElectron Density= 250.62 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fluorthalenite-(Y) is Not Radioactive

Fluorthalenite-(Y) Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin) PHYS. PROP.(Am.Min.,Vol.83,p908,1998) OPTIC PROP.(AmMin)
Help on See Also: 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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Dana No: 55.02.01b.04 Strunz No: 09.BJ.20





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