Mineralogy Database

Thalenite-(Y) Mineral Data

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General Thalenite-(Y) Information

Help on Chemical  Formula: Chemical Formula: Y3Si3O10(OH)
Help on Composition: Composition: Molecular Weight = 527.98 gm
   Yttrium   50.52 %  Y    64.15 % Y2O3
   Silicon   15.96 %  Si   34.14 % SiO2
   Hydrogen   0.19 %  H     1.71 % H2O
   Oxygen    33.33 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y3Si3O10(OH)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1898
Help on Locality: Locality: Askagen, Vermland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Tobins Robert Thalen (1827-1905), Swedish physicist.
Help on Name Pronunciation: Name Pronunciation: Thalenite-(Y) + Pronunciation Say THALENITE-(Y)
Help on Synonym: Synonym: ICSD 65001
  PDF 38-439

Thalenite-(Y) Image

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Comments: Subhedral, brownish thalenite-(Y) crystal embedded in a sucrosic matrix of yttrian fluorite.
Location: Hundholmen, Tysfjord, Norway. Scale: 0.5 cm.
© Sigurd Stordal / University of Tromsoe

Thalenite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9323:1:0.6573
Help on Cell Dimensions: Cell Dimensions: a = 10.34, b = 11.09, c = 7.29, Z = 4; beta = 96.9° V = 829.89 Den(Calc)= 4.23
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.1(1), 2.81(0.4), 2.75(0.3),

Physical Properties of Thalenite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Pink, Brownish green, Brown.
Help on Density: Density: 4.2
Help on Diaphaneity: Diaphaneity: Translucent to subtranslucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Thalenite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1744,KPDmeas= 0.1756,KC= 0.1859
Ncalc = 1.78 - 1.79
Help on Optical Data: Optical Data: Biaxial (-), a=1.731, b=1.738, g=1.744, bire=0.0130, 2V(Calc)=84, 2V(Meas)=68.

Calculated Properties of Thalenite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.95 gm/cc
note: Specific Gravity of Thalenite-(Y) =4.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0076128673
Boson Index = 0.9923871327
Help on Photoelectric: Photoelectric: PEThalenite-(Y) = 63.75 barns/electron
U=PEThalenite-(Y) x rElectron Density= 251.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thalenite-(Y) is Not Radioactive

Thalenite-(Y) Classification

Help on  Dana Class: Dana Class: 55.02.01b.02 (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 Thalenite-(Y) Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Thalenite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: 55.02.01b.02 Strunz No: 09.BJ.20





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