Chabazite-Na Mineral Data

General Chabazite-Na Information

Chemical Formula:

(Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O)

Composition:

Molecular Weight = 1,046.27 gm

Potassium 3.92 % K 4.73 % K₂O

Sodium 6.83 % Na 9.21 % Na₂O

Strontium 0.42 % Sr 0.50 % SrO

Calcium 0.73 % Ca 1.02 % CaO

Magnesium 0.05 % Mg 0.08 % MgO

Aluminum 11.68 % Al 22.07 % Al₂O₃

Iron 0.05 % Fe 0.07 % FeO

Silicon 19.86 % Si 42.50 % SiO₂

Hydrogen 2.21 % H 19.75 % H₂O

Oxygen 54.24 % O

______ ______

100.00 % 99.92 % = TOTAL OXIDE

Empirical Formula:

Na_3.11Ca_0.19K_1.05Mg_0.02Sr_0.05Al_4.53Fe²⁺_0.01Si_7.4O₂₄·11.47(H₂O)

Environment:

Amygdaloidal cavities of basalt and related rocks.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Biggest"Faraglione" facing AciTrezza, Sicily, Italy (Passaglia, 1970, #1). Link to MinDat.org Location Data.

Name Origin:

The Na-dominant member of the chabazite series.

Name Pronunciation:

Chabazite-Na + Pronunciation

Synonym:

Herschelite

Chabazite-Na Image

Images:

Click Here for Larger Chabazite-Na Image

Chabazite-Na Herschelite

Comments: Rounded transparent crystals of chabazite-Na (herschelite).
Location: Horseshoe Dam, Maricopa County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Chabazite-Na Crystallography

Axial Ratios:

a:c = 1:1.08635

Cell Dimensions:

a = 13.78, c = 14.97, Z = 3; V = 2,461.79 Den(Calc)= 2.12

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 5.03(1), 5.56(1), 9.46(1),

Crystal Structure:

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Mazzi F , Galli E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1983 (1983) p.461-480, The tetrahedral framework of chabazite, Locality: Richmond, Melbourne, Victoria, Australia, Note: Occupancies invented to match formula and refinement, Sample: C 4a, trigonal refinement

Physical Properties of Chabazite-Na

Cleavage:

{1011} Imperfect

Color:

Colorless, White, Yellowish, Pinkish, Reddish white.

Density:

2.05 - 2.15, Average = 2.09

Diaphaneity:

Translucent to transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

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

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chabazite-Na

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2282,KPDmeas= 0.2304,KC= 0.2311
Ncalc = 1.47 - 1.5

Optical Data:

Biaxial (+/-), a=1.478-1.485, b=1.48-1.4895, g=1.48-1.49, bire=0.0020-0.0050, 2V(Calc)=0-36, 2V(Meas)=0-32. Dispersion none.

Calculated Properties of Chabazite-Na

Electron Density:

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

Fermion Index:

Fermion Index = 0.0099056302
Boson Index = 0.9900943698

Photoelectric:

PE_Chabazite-Na= 2.19 barns/electron
U=PE_Chabazite-Na x r_electron= 4.65 barns/cc.

Radioactivity:

GRapi = 57.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Chabazite-Na per GRapi unit = 1.74 (%)

Estimated Radioactivity from Chabazite-Na - barely detectable

Chabazite-Na Classification

Dana Class:

77.01.02.01a (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.10 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

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

09.GD.10 Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

09.GD.10 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O P1 1

09.GD.10 Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

09.GD.10 Herschelite? (Na,Ca,K)AlSi2O6•3(H2O) R 3m 3 2/m

09.GD.10 Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]•6(H2O) R 3m 3 2/m

09.GD.10 Willhendersonite KCaAl3Si3O12•5(H2O) P1 1

Other Chabazite-Na Information

References:

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

See Also:

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

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Print or Cut-and-Paste your Chabazite-Na Specimen Label here :

Chabazite-Na

(Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O)
Dana No: 77.01.02.01a Strunz No: 09.GD.10
Locality:

Notes: