Mineralogy Database

Gmelinite-K Mineral Data

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General Gmelinite-K Information

Help on Chemical  Formula: Chemical Formula: (K,Na,Ca)6(Al7Si17O48)•22(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K3.25Ca0.57Na1.73Al7.39Si17.1O48.34•21.66(H2O)
Help on Environment: Environment: Druzy cavities within brecciated pegmatite in alkaline rocks.
Help on IMA Status: IMA Status: Approved IMA 2001 (Dana # Added)
Help on Locality: Locality: Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Name Pronunciation: Name Pronunciation: Gmelinite-K + Pronunciation Say GMELINITE-K
Help on Synonym: Synonym: IMA1999-039
 

Gmelinite-K Image

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  Gmelinite-K

Comments: Pink to reddish brown gmelinite-K crystals in a cavity in matrix.
Location: Fara Vicentino, Vicenza, Veneto, Italy. Scale: Not Given.
© Diederik Visser

Gmelinite-K Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.7528
Help on Cell Dimensions: Cell Dimensions: a = 13.621, c = 10.254, Z = 1; V = 1,647.56 Den(Calc)= 2.05
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),
 

Physical Properties of Gmelinite-K

Help on Cleavage: Cleavage: {1010} Good, {0001} Parting
Help on Color: Color: Colorless, Brownish white.
Help on Density: Density: 2
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Gmelinite-K

Help on Gladstone-Dale: 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
Ncalc = 1.46 - 1.48
Help on Optical Data: Optical Data: Uniaxial (-), e=1.471, w=1.477, bire=0.0060.
 

Calculated Properties of Gmelinite-K

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.08 gm/cc
note: Specific Gravity of Gmelinite-K =2.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGmelinite-K = 2.02 barns/electron
U=PEGmelinite-K x relectron= 4.19 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 91.48 (Gamma Ray American Petroleum Institute Units)
Concentration of Gmelinite-K per GRapi unit = 1.09 (%)

Estimated Radioactivity from Gmelinite-K - barely detectable

 

Gmelinite-K Classification

Help on  Dana Class: Dana Class: 77.01.02.06b (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
Help on  Strunz Class: Strunz Class: 09.GD.05 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GD -Chains of 6-membered rings � tabular zeolites
 
09.GD.05 Gmelinite-Ca! (Ca,Na2)Al2Si4O12•6(H2O) P 63/mmc 6/m 2/m 2/m
 
09.GD.05 Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)•22(H2O) P 63/mmc 6/m 2/m 2/m
 
09.GD.05 Gmelinite-Na (Na2,Ca)Al2Si4O12•6(H2O) P 63/mmc 6/m 2/m 2/m
 

Other Gmelinite-K Information

Help on References: References: NAME( AmMin, 87:1510) PHYS. PROP.(AmMin, 87:1510, CanMin, v 35, p 1583) OPTIC PROP.(AmMin, 87:1510)
Help on See Also: See Also: Links to other databases for Gmelinite-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 Gmelinite-K Specimen Label here :

Gmelinite-K

(K,Na,Ca)6(Al7Si17O48)•22(H2O)
Dana No: 77.01.02.06b Strunz No: 09.GD.05
Locality:

 

Notes:

 

 
   
 


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