Thomsonite-Sr Mineral Data

Thomsonite-Sr Mineral Data +

General Thomsonite-Sr Information

Chemical Formula:

(Sr,Ca)2Na[Al5Si5O20]·7(H2O)

Composition:

Molecular Weight = 892.94 gm

Sodium 2.57 % Na 3.47 % Na₂O

Strontium 13.74 % Sr 16.25 % SrO

Calcium 2.69 % Ca 3.77 % CaO

Aluminum 15.11 % Al 28.55 % Al₂O₃

Silicon 15.73 % Si 33.64 % SiO₂

Hydrogen 1.60 % H 14.32 % H₂O

Oxygen 48.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr_1.4Ca_0.6NaAl₅Si₅O₂₀·7.1(H₂O)

Environment:

Hydrothermal veinlets cutting natrolite-bearing core of a pegmatite dike. Thomsonite series zeolite; structure

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Rasvomchorr Mountain, Khibiny alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the Sr dominant analog of thomsonite-Ca.

Synonym:

IMA2000-025

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Thomsonite-Sr Crystallography

Axial Ratios:

a:b:c =0.9944:1:1.0089

Cell Dimensions:

a = 13.05, b = 13.123, c = 13.241, Z = 4; V = 2,267.59 Den(Calc)= 2.62

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcnn

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

By Intensity(I/I_o): 2.691(1)(242), 2.86(1)(142,241,412), 2.96(1)(024,204,042),3.49(0.9)(312,321), 3.19(0.8)(223,232,322), 4.66(0.8)(022,220), 6.63(0.7),

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Physical Properties of Thomsonite-Sr

Cleavage:

[100] Perfect, [010] Good

Color:

Colorless.

Density:

2.47

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Thomsonite-Sr

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2036,KPDmeas= 0.2159,KC= 0.2158

Optical Data:

Biaxial (+), a=1.528, b=1.532, g=1.54, bire=0.0120, 2V(Calc)=72, 2V(Meas)=62. Dispersion weak, r > v.

Calculated Properties of Thomsonite-Sr

Electron Density:

r_electron=2.45 gm/cc
note: r_{Thomsonite-Sr}=2.47 gm/cc.

Fermion Index

Fermion Index = 0.01723
Boson Index = 0.98277

Photoelectric:

PE_{Thomsonite-Sr}= 16.12 barns/electron
U=PE_{Thomsonite-Sr} x r_electron= 39.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thomsonite-Sr is Not Radioactive

Thomsonite-Sr Classification

Dana Class:

77.1.5.10 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.5)Natrolite and related species

77.1.5.1 Natrolite Na2[Al2Si3O10]·2(H2O) F dd2 mm2

77.1.5.2 Tetranatrolite? Na2[Al2Si3O10]·2(H2O) I 42d 4 2m

77.1.5.3 Paranatrolite Na2[Al2Si3O10]·3(H2O) Cc m

77.1.5.4 Mesolite Na2Ca2Al6Si9O30·8(H2O) C 2 2

77.1.5.5 Scolecite CaAl2Si3O10·3(H2O) Cc m

77.1.5.6 Edingtonite BaAl2Si3O10·4(H2O) P 2₁2₁2 2 2 2

77.1.5.7 Gonnardite Na2CaAl4Si6O20·7(H2O) I 42d 4 2m

77.1.5.8 Cowlesite CaAl2Si3O10·5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

77.1.5.9 Thomsonite-Ca NaCa2Al5Si5O20·6(H2O) Pncn 2/m 2/m 2/m

77.1.5.10 Thomsonite-Sr ! (Sr,Ca)2Na[Al5Si5O20]·7(H2O) Pcnn 2/m 2/m 2/m

77.1.5.11 Nabesite! Na2BeSi4O10·4(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

VIII/J.21-80 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.21 - Zeolite group, Natrolite - Thomsonite series

VIII/J.21-10 Natrolite Na2[Al2Si3O10]·2(H2O) F dd2 mm2

VIII/J.21-20 Paranatrolite Na2[Al2Si3O10]·3(H2O) Cc m

VIII/J.21-30 Tetranatrolite? Na2[Al2Si3O10]·2(H2O) I 42d 4 2m

VIII/J.21-40 Gonnardite Na2CaAl4Si6O20·7(H2O) I 42d 4 2m

VIII/J.21-50 Mesolite Na2Ca2Al6Si9O30·8(H2O) C 2 2

VIII/J.21-60 Scolecite CaAl2Si3O10·3(H2O) Cc m

VIII/J.21-70 Thomsonite-Ca NaCa2Al5Si5O20·6(H2O) Pncn 2/m 2/m 2/m

VIII/J.21-80 Thomsonite-Sr (Sr,Ca)2Na[Al5Si5O20]·7(H2O) Pcnn 2/m 2/m 2/m

Other Thomsonite-Sr Information

References:

NAME( AmMin, Vol 87, p 1511) PHYS. PROP.(AmMin, Vol 87, p 1511) OPTIC PROP.(AmMin, Vol 87, p 1511)

See Also:

Links to other databases for Thomsonite-Sr :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Thomsonite-Sr Specimen Label here :

Thomsonite-Sr

(Sr,Ca)2Na[Al5Si5O20]·7(H2O)
Dana No: 77.1.5.10 Strunz No: VIII/J.21-80
Locality:

Notes: