General Gmelinite-Na Information
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Chemical Formula: |
(Na2,Ca)Al2Si4O12·6(H2O) |
Composition: |
Molecular Weight = 2,000.77 gm |
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Potassium 0.31 % K 0.38 % K2O |
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Sodium 8.74 % Na 11.79 % Na2O |
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Calcium 0.06 % Ca 0.08 % CaO |
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Aluminum 9.99 % Al 18.88 % Al2O3 |
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Silicon 23.15 % Si 49.52 % SiO2 |
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Hydrogen 2.17 % H 19.36 % H2O |
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Oxygen 55.58 % O |
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______ ______ |
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100.00 % 100.01 % = TOTAL OXIDE |
Empirical Formula: |
Na7.61Ca0.03K0.16Al7.41Si16.49O48·21.5(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. |
Synonym: |
Gmelinite |
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Gmelinite-Na Image |
Images:
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Gmelinite-Na Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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Physical Properties of Gmelinite-Na
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Cleavage: |
[1010] Good, [0001] Parting |
Color: |
White, Reddish white, Pink, Greenish white, Flesh red. |
Density: |
2.03 - 2.17, Average = 2.09 |
Diaphaniety: |
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 |
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Optical Properties of Gmelinite-Na
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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 |
Optical Data: |
Uniaxial (+/-), a=1.474-1.481, b=1.476-1.494, bire=0.0020-0.0130. |
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Calculated Properties of Gmelinite-Na
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Electron Density: |
relectron=2.13 gm/cc note: rGmelinite-Na =2.10 gm/cc. |
Fermion Index |
Fermion Index = 0.01108 Boson Index = 0.98892 |
Photoelectric: |
PEGmelinite-Na = 1.40 barns/electron U=PEGmelinite-Na x relectron= 2.98 barns/cc. |
Radioactivity: |
GRapi = 4.58 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Gmelinite-Na - barely detectable
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Gmelinite-Na Classification
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Dana Class: |
77.1.2.6 (77)Tectosilicate Zeolite group |
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(77.1)true zeolites |
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(77.1.2)Chabazite and related species |
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77.1.2.1 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]·12H2O P1 1 |
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77.1.2.1a Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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77.1.2.1b Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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77.1.2.1c Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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77.1.2.2 Herschelite? (Na,Ca,K)AlSi2O6·3(H2O) R 3m 3 2/m |
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77.1.2.3 Willhendersonite KCaAl3Si3O12·5(H2O) P1 1 |
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77.1.2.4 Offretite (K2,Ca,Mg)2.5Al5Si13O36·15(H2O) P 6m2 6 m2 |
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77.1.2.5 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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77.1.2.5a Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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77.1.2.5b Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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77.1.2.6 Gmelinite-Na (Na2,Ca)Al2Si4O12·6(H2O) P 63/mmc 6/m 2/m 2/m |
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77.1.2.6a Gmelinite-Ca! (Ca,Na2)Al2Si4O12·6(H2O) P 63/mmc 6/m 2/m 2/m |
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77.1.2.6b Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)·22(H2O) P 63/mmc 6/m 2/m 2/m |
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77.1.2.7 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m |
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77.1.2.7a Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m |
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77.1.2.7b Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m |
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77.1.2.8 Levyne-Ca (Ca,Na2,K2)Al2Si4O12·6(H2O) R 3m 3 2/m |
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77.1.2.8a Levyne-Na! (Na2,Ca,K2)Al2Si4O12·6(H2O) R 3m 3 2/m |
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77.1.2.9 Tschortnerite! Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]·x(H2O),x>=20 F m3m 4/m 3 2/m |
Strunz Class: |
VIII/J.26-50 VIII - Silicates |
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VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites |
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VIII/J.26 - Zeolite group, Willhendersonite - Chabazite - Perialite series |
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VIII/J.26-10 Willhendersonite KCaAl3Si3O12·5(H2O) P1 1 |
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VIII/J.26-20 Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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VIII/J.26-25 Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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VIII/J.26-30 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]·12H2O P1 1 |
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VIII/J.26-35 Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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VIII/J.26-40 Tschernichite (Ca,Na)(Si6Al2)O16·4-8(H2O) P 4/mmm 4/m 2/m 2/m |
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VIII/J.26-50 Gmelinite-Na (Na2,Ca)Al2Si4O12·6(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-52 Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)·22(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-54 Gmelinite-Ca! (Ca,Na2)Al2Si4O12·6(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-58 Levyne-Na! (Na2,Ca,K2)Al2Si4O12·6(H2O) R 3m 3 2/m |
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VIII/J.26-60 Levyne-Ca (Ca,Na2,K2)Al2Si4O12·6(H2O) R 3m 3 2/m |
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VIII/J.26-70 Offretite (K2,Ca,Mg)2.5Al5Si13O36·15(H2O) P 6m2 6 m2 |
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VIII/J.26-80 Mazzite K2CaMg2(Al,Si)36O72·28(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-90 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-92 Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-94 Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-95 Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72·30(H2O) P 63/mmc, P 62c-, P 63mc Hex |
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VIII/J.26-100 Perlialite K8Tl4Al12Si24O72·20(H2O) P 6/mmm 6/m 2/m 2/m |
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Other Gmelinite-Na Information
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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 - Crocoite.com Mineral Locations
6 -Google Images
7 -Google Scholar
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
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Print or Cut-and-Paste your Gmelinite-Na Specimen Label here :
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Gmelinite-Na
(Na2,Ca)Al2Si4O12·6(H2O)
Dana No: 77.1.2.6 Strunz No: VIII/J.26-50
Locality:
Notes:
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