Chabazite-K Mineral Data

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General Chabazite-K Information

Chemical Formula:

(K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O)

Composition:

Molecular Weight = 504.66 gm

Potassium 4.65 % K 5.60 % K₂O

Sodium 0.46 % Na 0.61 % Na₂O

Calcium 2.38 % Ca 3.33 % CaO

Magnesium 0.10 % Mg 0.16 % MgO

Aluminum 10.69 % Al 20.20 % Al₂O₃

Silicon 22.26 % Si 47.62 % SiO₂

Hydrogen 2.40 % H 21.42 % H₂O

Oxygen 57.07 % O

______ ______

100.00 % 98.95 % = TOTAL OXIDE

Empirical Formula:

K_0.6Ca_0.3Na_0.1Mg_0.02Al₂Si₄O₁₂•6(H₂O)

Environment:

Amygdaloidal cavities of basalt and related rocks.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Tufo Ercolano, Ercolano, Naples, Italy (De Gennaro and Franco, Link to MinDat.org Location Data.

Name Origin:

From Gk. chabazios, tune or melody, one of twenty stones named in the poem Peri lithos. The K-dominant member of the chabazite series.

Name Pronunciation:

Chabazite-K + Pronunciation

Chabazite-K Image

Images:

Chabazite-K

Comments: Minute colorless crystals of chabazite-K on matrix.
Location: Tyul'bnyunuai River Valley, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 0.6 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Chabazite-K Crystallography

Axial Ratios:

a:c = 1:1.08635

Cell Dimensions:

a = 13.78, c = 14.97, Z = 6; V = 2,461.79 Den(Calc)= 2.04

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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Gualtieri A F , Passaglia E , European Journal of Mineralogy , 18 (2006) p.351-359, Rietveld structure refinement of NH4-exchanged natural chabazite, Locality: Wasson s Bluff, Two Islands, Nova Scotia, Canada

Physical Properties of Chabazite-K

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-K

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2371,KPDmeas= 0.2304,KC= 0.2332
Ncalc = 1.48 - 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-K

Electron Density:

Bulk Density (Electron Density)=2.14 gm/cc
note: Specific Gravity of Chabazite-K =2.10 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Chabazite-K= 1.97 barns/electron
U=PE_Chabazite-K x r_electron= 4.22 barns/cc.

Radioactivity:

GRapi = 68.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Chabazite-K per GRapi unit = 1.47 (%)

Estimated Radioactivity from Chabazite-K - barely detectable

Chabazite-K Classification

Dana Class:

77.01.02.01b (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-K Information

References:

NAME( CanMin, v 35, p 1579) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Chabazite-K :
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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Print or Cut-and-Paste your Chabazite-K Specimen Label here :

Chabazite-K

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

Notes: