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Gmelinite-Ca Mineral Data

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General Gmelinite-Ca Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na2)Al2Si4O12•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2.06Sr1.35Na0.78(K)0.11Al7.82Si16.49O48•23.23(H2O)
Help on Environment: Environment: Alteration product of basalts.
Help on IMA Status: IMA Status: Approved IMA 1982 (Dana # Added)
Help on Locality: Locality: Montecchio Maggiore, Vicenza, Italy. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Gmelinite-Ca + Pronunciation Say GMELINITE-CA

Gmelinite-Ca Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.72202
Help on Cell Dimensions: Cell Dimensions: a = 13.8, c = 9.964, Z = 1; V = 1,643.32 Den(Calc)= 2.11
Help on Crystal System: 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/Io): 4.1(1), 12.9(0.9), 2.96(0.8),

Physical Properties of Gmelinite-Ca

Help on Cleavage: Cleavage: {1010} Good, {0001} Parting
Help on Color: Color: White, Reddish white, Pink, Greenish white, Flesh red.
Help on Density: Density: 2.03 - 2.17, Average = 2.09
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white

Optical Properties of Gmelinite-Ca

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+/-), a=1.474-1.481, b=1.476-1.494, bire=0.0020-0.0130.

Calculated Properties of Gmelinite-Ca

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.12 gm/cc
note: Specific Gravity of Gmelinite-Ca =2.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGmelinite-Ca = 7.66 barns/electron
U=PEGmelinite-Ca x relectron= 16.24 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.02)Chabazite and related species Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O P1 1 Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]•6(H2O) R 3m 3 2/m Herschelite? (Na,Ca,K)AlSi2O6•3(H2O) R 3m 3 2/m Willhendersonite KCaAl3Si3O12•5(H2O) P1 1 Offretite (K2,Ca,Mg)2.5Al5Si13O36•15(H2O) P 6m2 6 m2 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15(H2O) P 63/mmc 6/m 2/m 2/m Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]•15(H2O) P 63/mmc 6/m 2/m 2/m Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]•15(H2O) P 63/mmc 6/m 2/m 2/m Gmelinite-Na (Na2,Ca)Al2Si4O12•6(H2O) P 63/mmc 6/m 2/m 2/m Gmelinite-Ca! (Ca,Na2)Al2Si4O12•6(H2O) P 63/mmc 6/m 2/m 2/m Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)•22(H2O) P 63/mmc 6/m 2/m 2/m Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m Levyne-Ca (Ca,Na2,K2)Al2Si4O12•6(H2O) R 3m 3 2/m Levyne-Na! (Na2,Ca,K2)Al2Si4O12•6(H2O) R 3m 3 2/m Tschortnerite! Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O),x>=20 F m3m 4/m 3 2/m
Help on  Strunz Class: 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-Ca Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(CanMin, v 35, p 1583) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 09.GD.05





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