Thomsonite-Sr Mineral Data

Advertisment

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

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.

Name Pronunciation:

Thomsonite-Sr + Pronunciation

Synonym:

IMA2000-025

Thomsonite-Sr Image

Images:

Thomsonite-Sr

Comments: White, columnar-acicular crystals of shomsonite-Sr lining a vug.
Location: Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 0.5 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

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),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 1 0 1) ( 0 1 1) ( 0 1 0) ( 1 1 1) ( 1 0 0) ( 1 1 0) ( 0 0 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Gurbanova O A , Rastsvetaeva R K , Pekov I V , Turchkova A G , Doklady Akademii Nauk SSSR , 376 (2001) p.387-390, Crystal structure of strontium-rich thomsonite, Locality: Khibiny alkaline massif, Kola peninsula, Russia

Physical Properties of Thomsonite-Sr

Cleavage:

{100} Perfect, {010} Good

Color:

Colorless.

Density:

2.47

Diaphaneity:

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
Ncalc = 1.53 - 1.57

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:

Bulk Density (Electron Density)=2.45 gm/cc
note: Specific Gravity of Thomsonite-Sr =2.47 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thomsonite-Sr is Not Radioactive

Thomsonite-Sr Classification

Dana Class:

77.01.05.10 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.05)Natrolite and related species

77.01.05.01 Natrolite Na2[Al2Si3O10]•2(H2O) F dd2 mm2

77.01.05.02 Tetranatrolite? Na2[Al2Si3O10]•2(H2O) I 42d 4 2m

77.01.05.03 Paranatrolite Na2[Al2Si3O10]•3(H2O) Cc m

77.01.05.04 Mesolite Na2Ca2Al6Si9O30•8(H2O) C 2 2

77.01.05.05 Scolecite CaAl2Si3O10•3(H2O) Cc m

77.01.05.06 Edingtonite BaAl2Si3O10•4(H2O) P 2₁2₁2 2 2 2

77.01.05.07 Gonnardite Na2CaAl4Si6O20•7(H2O) I 42d 4 2m

77.01.05.08 Cowlesite CaAl2Si3O10•5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

77.01.05.09 Thomsonite-Ca NaCa2Al5Si5O20•6(H2O) Pncn 2/m 2/m 2/m

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

77.01.05.11 Nabesite! Na2BeSi4O10•4(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

09.GA.10 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GA -Zeolites with T5O10 Units – The Fibrous Zeolites

09.GA.10 Thomsonite-Ca NaCa2Al5Si5O20•6(H2O) Pncn 2/m 2/m 2/m

09.GA.10 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Thomsonite-Sr using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Thomsonite-Sr :

Dakota Matrix Minerals Google Search for Thomsonite-Sr
John Betts Fine Minerals Search for Thomsonite-Sr
McDougall Minerals Google Search for Thomsonite-Sr
Rock and Mineral Shows Google Search for Thomsonite-Sr
Weinrich Minerals, Inc. Google Search for Thomsonite-Sr

Ask about Thomsonite-Sr here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Thomsonite-Sr

(Sr,Ca)2Na[Al5Si5O20]•7(H2O)
Dana No: 77.01.05.10 Strunz No: 09.GA.10
Locality:

Notes: