Gmelinite-Na Mineral Data

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General Gmelinite-Na Information

Chemical Formula:

(Na2,Ca)Al2Si4O12•6(H2O)

Composition:

Molecular Weight = 2,000.77 gm

Potassium 0.31 % K 0.38 % K₂O

Sodium 8.74 % Na 11.79 % Na₂O

Calcium 0.06 % Ca 0.08 % CaO

Aluminum 9.99 % Al 18.88 % Al₂O₃

Silicon 23.15 % Si 49.52 % SiO₂

Hydrogen 2.17 % H 19.36 % H₂O

Oxygen 55.58 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Na_7.61Ca_0.03K_0.16Al_7.41Si_16.49O₄₈•21.5(H₂O)

Environment:

Alteration product of basalts.

IMA Status:

Valid Species (Pre-IMA) 1825

Locality:

Montecchio Maggiore, Vicenza, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after the German mineralogist and chemist, Christian Gottlob Gmelin (1792-1860) of Turbingen, Germany. Na modifier added by the zeolite nomenclature committee.

Name Pronunciation:

Gmelinite-Na + Pronunciation

Synonym:

Gmelinite

Gmelinite-Na Image

Images:

Gmelinite-Na

Comments: White crystalline aggregate of gmelinite.
Location: Antrim, Northern Ireland. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Gmelinite-Na Crystallography

Axial Ratios:

a:c = 1:0.73044

Cell Dimensions:

a = 13.756, c = 10.048, Z = 1; V = 1,646.63 Den(Calc)= 2.02

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 4.1(1), 12.9(0.9), 2.96(0.8),

Crystal Structure:

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Sacerdoti M , Passaglia E , Carnevali R , Zeolites , 15 (1995) p.276-281, Structural refinements of Na-, K-, and Ca-exchanged gmelinites, Note: sample 1Na

Physical Properties of Gmelinite-Na

Cleavage:

{1010} Good, {0001} Parting

Color:

White, Reddish white, Pink, Greenish white, Flesh red.

Density:

2.03 - 2.17, Average = 2.09

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Gmelinite-Na

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2382,KPDmeas= 0.2292,KC= 0.2312
Ncalc = 1.47 - 1.5

Optical Data:

Uniaxial (+/-), a=1.474-1.481, b=1.476-1.494, bire=0.0020-0.0130.

Calculated Properties of Gmelinite-Na

Electron Density:

Bulk Density (Electron Density)=2.13 gm/cc
note: Specific Gravity of Gmelinite-Na =2.10 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Gmelinite-Na= 1.40 barns/electron
U=PE_Gmelinite-Na x r_electron= 2.98 barns/cc.

Radioactivity:

GRapi = 4.58 (Gamma Ray American Petroleum Institute Units)
Concentration of Gmelinite-Na per GRapi unit = 21.82 (%)

Estimated Radioactivity from Gmelinite-Na - barely detectable

Gmelinite-Na Classification

Dana Class:

77.01.02.06 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.02)Chabazite and related species

77.01.02.01 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O P1 1

77.01.02.01a Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.01b Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.01c Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.02 Herschelite? (Na,Ca,K)AlSi2O6•3(H2O) R 3m 3 2/m

77.01.02.03 Willhendersonite KCaAl3Si3O12•5(H2O) P1 1

77.01.02.04 Offretite (K2,Ca,Mg)2.5Al5Si13O36•15(H2O) P 6m2 6 m2

77.01.02.05 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.05a Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.05b Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06 Gmelinite-Na (Na2,Ca)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06a Gmelinite-Ca! (Ca,Na2)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06b Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)•22(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.07 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.07a Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.07b Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.08 Levyne-Ca (Ca,Na2,K2)Al2Si4O12•6(H2O) R 3m 3 2/m

77.01.02.08a Levyne-Na! (Na2,Ca,K2)Al2Si4O12•6(H2O) R 3m 3 2/m

77.01.02.09 Tschortnerite! Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O),x>=20 F m3m 4/m 3 2/m

Strunz Class:

09.GD.05 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GD -Chains of 6-membered rings – tabular zeolites

09.GD.05 Gmelinite-Ca! (Ca,Na2)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

09.GD.05 Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)•22(H2O) P 6₃/mmc 6/m 2/m 2/m

09.GD.05 Gmelinite-Na (Na2,Ca)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

Other Gmelinite-Na Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Gmelinite-Na :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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Gmelinite-Na

(Na2,Ca)Al2Si4O12•6(H2O)
Dana No: 77.01.02.06 Strunz No: 09.GD.05
Locality:

Notes: