Gmelinite-K Mineral Data

Gmelinite-K Mineral Data +

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General Gmelinite-K Information

Chemical Formula:

(K,Na,Ca)6(Al7Si17O48)·22(H2O)

Composition:

Molecular Weight = 2,032.96 gm

Potassium 6.25 % K 7.53 % K₂O

Sodium 1.96 % Na 2.64 % Na₂O

Calcium 1.12 % Ca 1.57 % CaO

Aluminum 9.81 % Al 18.53 % Al₂O₃

Silicon 23.62 % Si 50.54 % SiO₂

Hydrogen 2.15 % H 19.19 % H₂O

Oxygen 55.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_3.25Ca_0.57Na_1.73Al_7.39Si_17.1O_48.34·21.66(H₂O)

Environment:

Druzy cavities within brecciated pegmatite in alkaline rocks.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the German mineralogist and chemist, Christian Gottlob Gmelin (1792-1860) of Turbingen, Germany. The K-dominant member of the gmelinite series.

Synonym:

IMA1999-039

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Gmelinite-K Crystallography

Axial Ratios:

a:c = 1:0.7528

Cell Dimensions:

a = 13.621, c = 10.254, Z = 1; V = 1,647.56 Den(Calc)= 2.05

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.719(1)(123), 4.11(1)(121,112), 1.817(0.8),2.852(0.8)(041,222), 2.971(0.8)(040), 11.9(0.8)(010), 5.16(0.7)(021,002), 3.27(0.7)(130,013), 2.085(0.5),

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 2K

Physical Properties of Gmelinite-K

Cleavage:

[1010] Good, [0001] Parting

Color:

Colorless, Brownish white.

Density:

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gmelinite-K

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2312,KPDmeas= 0.237,KC= 0.2318

Optical Data:

Uniaxial (-), e=1.471, w=1.477, bire=0.0060.

Calculated Properties of Gmelinite-K

Electron Density:

r_electron=2.08 gm/cc
note: r_Gmelinite-K=2.05 gm/cc.

Fermion Index

Fermion Index = 0.01132
Boson Index = 0.98868

Photoelectric:

PE_Gmelinite-K= 2.02 barns/electron
U=PE_Gmelinite-K x r_electron= 4.19 barns/cc.

Radioactivity:

GRapi = 91.48 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Gmelinite-K - barely detectable

Gmelinite-K Classification

Dana Class:

77.1.2.6b (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.26-52 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 Gmelinite-K Information

References:

NAME( AmMin, 87:1510) PHYS. PROP.(AmMin, 87:1510, CanMin, v 35, p 1583) OPTIC PROP.(AmMin, 87:1510)

See Also:

Links to other databases for Gmelinite-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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Gmelinite-K

(K,Na,Ca)6(Al7Si17O48)·22(H2O)
Dana No: 77.1.2.6b Strunz No: VIII/J.26-52
Locality:

Notes: