Chabazite-K Mineral Data

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.

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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),

Physical Properties of Chabazite-K

Cleavage:

[1011] Imperfect

Color:

Colorless, White, Yellowish, Pinkish, Reddish white.

Density:

2.05 - 2.15, Average = 2.09

Diaphaniety:

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

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:

r_electron=2.14 gm/cc
note: r_Chabazite-K=2.10 gm/cc.

Fermion Index

Fermion Index = 0.0108
Boson Index = 0.9892

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)

Estimated Radioactivity from Chabazite-K - barely detectable

Chabazite-K Classification

Dana Class:

77.1.2.1b (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.2)Chabazite and related species

77.1.2.1 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]·12H2O P1 1

77.1.2.1a Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m

77.1.2.1b Chabazite-K ! (K2,Ca,Na2,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m

77.1.2.1c Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]·6(H2O) R 3m 3 2/m

77.1.2.2 Herschelite? (Na,Ca,K)AlSi2O6·3(H2O) R 3m 3 2/m

77.1.2.3 Willhendersonite KCaAl3Si3O12·5(H2O) P1 1

77.1.2.4 Offretite (K2,Ca,Mg)2.5Al5Si13O36·15(H2O) P 6m2 6 m2

77.1.2.5 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]·15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.2.5a Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]·15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.2.5b Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]·15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.2.6 Gmelinite-Na (Na2,Ca)Al2Si4O12·6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.2.6a Gmelinite-Ca! (Ca,Na2)Al2Si4O12·6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.2.6b Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)·22(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.2.7 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

77.1.2.7a Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

77.1.2.7b Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

77.1.2.8 Levyne-Ca (Ca,Na2,K2)Al2Si4O12·6(H2O) R 3m 3 2/m

77.1.2.8a Levyne-Na! (Na2,Ca,K2)Al2Si4O12·6(H2O) R 3m 3 2/m

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.26-25 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.26 - Zeolite group, Willhendersonite - Chabazite - Perialite series

VIII/J.26-10 Willhendersonite KCaAl3Si3O12·5(H2O) P1 1

VIII/J.26-20 Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m

VIII/J.26-25 Chabazite-K (K2,Ca,Na2,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m

VIII/J.26-30 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]·12H2O P1 1

VIII/J.26-35 Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]·6(H2O) R 3m 3 2/m

VIII/J.26-40 Tschernichite (Ca,Na)(Si6Al2)O16·4-8(H2O) P 4/mmm 4/m 2/m 2/m

VIII/J.26-50 Gmelinite-Na (Na2,Ca)Al2Si4O12·6(H2O) P 6₃/mmc 6/m 2/m 2/m

VIII/J.26-52 Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)·22(H2O) P 6₃/mmc 6/m 2/m 2/m

VIII/J.26-54 Gmelinite-Ca! (Ca,Na2)Al2Si4O12·6(H2O) P 6₃/mmc 6/m 2/m 2/m

VIII/J.26-58 Levyne-Na! (Na2,Ca,K2)Al2Si4O12·6(H2O) R 3m 3 2/m

VIII/J.26-60 Levyne-Ca (Ca,Na2,K2)Al2Si4O12·6(H2O) R 3m 3 2/m

VIII/J.26-70 Offretite (K2,Ca,Mg)2.5Al5Si13O36·15(H2O) P 6m2 6 m2

VIII/J.26-80 Mazzite K2CaMg2(Al,Si)36O72·28(H2O) P 6₃/mmc 6/m 2/m 2/m

VIII/J.26-90 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]·15(H2O) P 6₃/mmc 6/m 2/m 2/m

VIII/J.26-92 Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]·15(H2O) P 6₃/mmc 6/m 2/m 2/m

VIII/J.26-94 Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]·15(H2O) P 6₃/mmc 6/m 2/m 2/m

VIII/J.26-95 Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72·30(H2O) P 6₃/mmc, P 6₂c-, P 6₃mc Hex

VIII/J.26-100 Perlialite K8Tl4Al12Si24O72·20(H2O) P 6/mmm 6/m 2/m 2/m

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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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: 77.1.2.1b Strunz No: VIII/J.26-25
Locality:

Notes: