Thomsonite-Ca Mineral Data

Thomsonite-Ca Mineral Data +

General Thomsonite-Ca Information

Chemical Formula:

NaCa2Al5Si5O20·6(H2O)

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

Empirical Formula:

NaCa₂Al₅Si₅O₂₀·6(H₂O)

Environment:

Found in cavities in lava and in amygdaloidal igneous rocks.

IMA Status:

Valid Species (Pre-IMA) 1820

Locality:

Kilpatrick Hills, Bunbarton, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named after the Scottish chemist, T. Thomson (1773-1852).

Synonym:

Bagotite

Thomsonite

Thomsonite-Ca Image

Images:

Click Here for Larger Thomsonite-Ca Image

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

Axial Ratios:

a:b:c =1.0036:1:1.0145

Cell Dimensions:

a = 13.1043, b = 13.0569, c = 13.2463, Z = 4; V = 2,266.46 Den(Calc)= 2.36

Crystal System:

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

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

By Intensity(I/I_o): 2.857(1), 2.944(1), 4.625(1),

Physical Properties of Thomsonite-Ca

Cleavage:

[101] Perfect, [100] Good

Color:

Colorless, Greenish, Yellow, White, Pink.

Density:

2.3 - 2.4, Average = 2.34

Diaphaniety:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

5-5.5 - Apatite-Knife Blade

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Thomsonite-Ca

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

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.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Thomsonite-Ca

Electron Density:

r_electron=2.37 gm/cc
note: r_{Thomsonite-Ca}=2.35 gm/cc.

Fermion Index

Fermion Index = 0.00851
Boson Index = 0.99149

Photoelectric:

PE_{Thomsonite-Ca}= 2.44 barns/electron
U=PE_{Thomsonite-Ca} x r_electron= 5.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thomsonite-Ca is Not Radioactive

Thomsonite-Ca Classification

Dana Class:

77.1.5.9 (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.21-70 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-Ca Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Thomsonite-Ca :
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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Thomsonite-Ca

NaCa2Al5Si5O20·6(H2O)
Dana No: 77.1.5.9 Strunz No: VIII/J.21-70
Locality:

Notes: