Mineralogy Database

Thomsonite-Ca Mineral Data

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General Thomsonite-Ca Information

Help on Chemical  Formula: Chemical Formula: NaCa2Al5Si5O20•6(H2O)
Help on Composition: Composition: Molecular Weight = 806.56 gm
   Sodium     2.85 %  Na    3.84 % Na2O
   Calcium    9.94 %  Ca   13.91 % CaO
   Aluminum  16.73 %  Al   31.60 % Al2O3
   Silicon   17.41 %  Si   37.25 % SiO2
   Hydrogen   1.50 %  H    13.40 % H2O
   Oxygen    51.58 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa2Al5Si5O20•6(H2O)
Help on Environment: Environment: Found in cavities in lava and in amygdaloidal igneous rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1820
Help on Locality: Locality: Kilpatrick Hills, Bunbarton, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Scottish chemist, T. Thomson (1773-1852).
Help on Name Pronunciation: Name Pronunciation: Thomsonite-Ca + Pronunciation Say THOMSONITE-CA
Help on Synonym: Synonym: Bagotite

Thomsonite-Ca Image

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  Thomsonite-Ca   Stilbite-Ca

Comments: Peach colored stilbite crystals to 3.5 cm in size is hosting two finely crystallized balls of powdery white thomsonite.
Location: Near Jalgaon, Maharashtra State, India. Scale: Picture size 15 cm.
© Dan Weinrich

Thomsonite-Ca Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0036:1:1.0145
Help on Cell Dimensions: Cell Dimensions: a = 13.1043, b = 13.0569, c = 13.2463, Z = 4; V = 2,266.46 Den(Calc)= 2.36
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pncn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.857(1), 2.944(1), 4.625(1),

Physical Properties of Thomsonite-Ca

Help on Cleavage: Cleavage: {101} Perfect, {100} Good
Help on Color: Color: Colorless, Greenish, Yellow, White, Pink.
Help on Density: Density: 2.3 - 2.4, Average = 2.34
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Thomsonite-Ca

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2222,KPDmeas= 0.2232,KC= 0.225
Ncalc = 1.52 - 1.54
Help on Optical Data: Optical Data: Biaxial (+), a=1.511-1.53, b=1.513-1.532, g=1.516-1.545, bire=0.0050-0.0150, 2V(Calc)=44-80, 2V(Meas)=44-75. Dispersion distinct to strong, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.

Calculated Properties of Thomsonite-Ca

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Thomsonite-Ca =2.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0085147492
Boson Index = 0.9914852508
Help on Photoelectric: Photoelectric: PEThomsonite-Ca = 2.44 barns/electron
U=PEThomsonite-Ca x rElectron Density= 5.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Thomsonite-Ca is Not Radioactive

Thomsonite-Ca Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.05)Natrolite and related species Natrolite Na2[Al2Si3O10]•2(H2O) F dd2 mm2 Tetranatrolite? Na2[Al2Si3O10]•2(H2O) I 42d 4 2m Paranatrolite Na2[Al2Si3O10]•3(H2O) Cc m Mesolite Na2Ca2Al6Si9O30•8(H2O) C 2 2 Scolecite CaAl2Si3O10•3(H2O) Cc m Edingtonite BaAl2Si3O10•4(H2O) P 21212 2 2 2 Gonnardite Na2CaAl4Si6O20•7(H2O) I 42d 4 2m Cowlesite CaAl2Si3O10•5-6(H2O) P 2221, P mmm, Pmm2 Ortho Thomsonite-Ca NaCa2Al5Si5O20•6(H2O) Pncn 2/m 2/m 2/m Thomsonite-Sr! (Sr,Ca)2Na[Al5Si5O20]•7(H2O) Pcnn 2/m 2/m 2/m Nabesite! Na2BeSi4O10•4(H2O) P 212121 2 2 2
Help on  Strunz Class: 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-Ca Information

Help on See Also: See Also: Links to other databases for Thomsonite-Ca :
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: Strunz No: 09.GA.10





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