Thalenite-(Y) Mineral Data

Thalenite-(Y) Mineral Data +

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General Thalenite-(Y) Information

Chemical Formula:

Y3Si3O10(OH)

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

Empirical Formula:

Y₃Si₃O₁₀(OH)

IMA Status:

Valid Species (Pre-IMA) 1898

Locality:

Askagen, Vermland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Tobins Robert Thalen (1827-1905), Swedish physicist.

Synonym:

ICSD 65001

PDF 38-439

Thalenite-(Y) Image

Images:

Thalenite-(Y)

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

Axial Ratios:

a:b:c =0.9323:1:0.6573

Cell Dimensions:

a = 10.34, b = 11.09, c = 7.29, Z = 4; beta = 96.9° V = 829.89 Den(Calc)= 4.23

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.1(1), 2.81(0.4), 2.75(0.3),

Physical Properties of Thalenite-(Y)

Cleavage:

None

Color:

Pink, Brownish green, Brown.

Density:

4.2

Diaphaniety:

Translucent to subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Thalenite-(Y)

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

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)

Electron Density:

r_electron=3.95 gm/cc
note: r_{Thalenite-(Y)}=4.20 gm/cc.

Fermion Index

Fermion Index = 0.00761
Boson Index = 0.99239

Photoelectric:

PE_{Thalenite-(Y)}= 63.75 barns/electron
U=PE_{Thalenite-(Y)} x r_electron= 251.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thalenite-(Y) is Not Radioactive

Thalenite-(Y) Classification

Dana Class:

55.2.1b.2 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.2)with cations in [6] coordination

(55.2.1b)Thortveitite related species

55.2.1b.1 Rowlandite-(Y) Y4FeSi4O14F2(?) None

55.2.1b.2 Thalenite-(Y) Y3Si3O10(OH) P 2₁/n 2/m

55.2.1b.3 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

55.2.1b.4 Fluorthalenite-(Y)! Y3Si3O10F P 2₁/m 2/m

Strunz Class:

VIII/C.33-10 VIII - Silicates

VIII/C - Sorosilicates with [Si3O10]8- groups

VIII/C.33 - Thalenite-(Y) series

VIII/C.33-05 Fluorthalenite-(Y)! Y3Si3O10F P 2₁/m 2/m

VIII/C.33-10 Thalenite-(Y) Y3Si3O10(OH) P 2₁/n 2/m

Other Thalenite-(Y) Information

References:

NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Thalenite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST

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

Thalenite-(Y)

Y3Si3O10(OH)
Dana No: 55.2.1b.2 Strunz No: VIII/C.33-10
Locality:

Notes: