Gmelinite-Ca Mineral Data

General Gmelinite-Ca Information

Chemical Formula:

(Ca,Na2)Al2Si4O12•6(H2O)

Composition:

Molecular Weight = 2,083.67 gm

Potassium 0.21 % K 0.25 % K₂O

Sodium 0.86 % Na 1.16 % Na₂O

Strontium 5.68 % Sr 6.71 % SrO

Calcium 3.96 % Ca 5.54 % CaO

Aluminum 10.13 % Al 19.13 % Al₂O₃

Silicon 22.23 % Si 47.55 % SiO₂

Hydrogen 2.25 % H 20.08 % H₂O

Oxygen 54.69 % O

______ ______

100.00 % 100.43 % = TOTAL OXIDE

Empirical Formula:

Ca_2.06Sr_1.35Na_0.78(K)_0.11Al_7.82Si_16.49O₄₈•23.23(H₂O)

Environment:

Alteration product of basalts.

IMA Status:

Approved IMA 1982 (Dana # Added)

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. The Ca-dominant member of the gmelinite series.

Name Pronunciation:

Gmelinite-Ca + Pronunciation

Gmelinite-Ca Image

Images:

Gmelinite-Ca

Comments: Tanslucent, salmon-colored gmelinite-Ca crystals.
Location: Sarbaiskoe deposit (Sarbai; Sarbay Mine), Qostaney Oblysy (Kostanai [Kustany] Oblast'), Kazakhstan. Scale: Specimen Size 7.9 x 5.9 x 5.1 cm.
© Rob Lavinsky

Gmelinite-Ca Crystallography

Axial Ratios:

a:c = 1:0.72202

Cell Dimensions:

a = 13.8, c = 9.964, Z = 1; V = 1,643.32 Den(Calc)= 2.11

Crystal System:

Hexagonal - Dihexagonal Dipyramidal H-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),

Physical Properties of Gmelinite-Ca

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-Ca

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2281,KPDmeas= 0.2292,KC= 0.2309
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-Ca

Electron Density:

Bulk Density (Electron Density)=2.12 gm/cc
note: Specific Gravity of Gmelinite-Ca =2.10 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Gmelinite-Ca= 7.66 barns/electron
U=PE_Gmelinite-Ca x r_electron= 16.24 barns/cc.

Radioactivity:

GRapi = 3.03 (Gamma Ray American Petroleum Institute Units)
Concentration of Gmelinite-Ca per GRapi unit = 33.01 (%)

Estimated Radioactivity from Gmelinite-Ca - barely detectable

Gmelinite-Ca Classification

Dana Class:

77.01.02.06a (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 ï¿½ 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-Ca Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(CanMin, v 35, p 1583) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Gmelinite-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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Gmelinite-Ca

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

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