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Gobbinsite Mineral Data

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General Gobbinsite Information

Help on Chemical  Formula: Chemical Formula: (Na2,Ca)2K2Al6Si10O32•12(H2O)
Help on Composition: Composition: Molecular Weight = 1,339.93 gm
   Potassium   6.13 %  K     7.38 % K2O
   Sodium      4.29 %  Na    5.78 % Na2O
   Calcium     1.79 %  Ca    2.51 % CaO
   Aluminum   12.48 %  Al   23.59 % Al2O3
   Silicon    20.96 %  Si   44.84 % SiO2
   Hydrogen    1.81 %  H    16.13 % H2O
   Oxygen     52.54 %  O
             ______        ______ 
             100.00 %      100.24 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2.5Ca0.6K2.1Al6.2Si10O32•12(H2O)
Help on Environment: Environment: Formed from sodium rich fluids, in basalts and related igneous rocks.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Basalt cliffs near Hills Port, south of the Gobbins area, County Antrim, Northern Ireland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Gobbinsite + Pronunciation Say GOBBINSITE
Help on Synonym: Synonym: ICSD 30975
  PDF 35-559
 

Gobbinsite Image

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  Gobbinsite

Comments: White opaque crystalline gobbinsite in vug.
Location: Island Magee, County, Antrim, Northern Ireland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gobbinsite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0307:1:1.0374
Help on Cell Dimensions: Cell Dimensions: a = 10.1027, b = 9.8016, c = 10.1682, Z = 1; V = 1,006.88 Den(Calc)= 2.21
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P mn21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.201(1), 4.116(1), 7.11(1),
 

Physical Properties of Gobbinsite

Help on Cleavage: Cleavage: None
Help on Color: Color: Lemon white, Chalky white, Light brown.
Help on Density: Density: 2.147
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Gobbinsite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.222,KPDmeas= 0.2285,KC= 0.2277
Ncalc = 1.49 - 1.5
Help on Optical Data: Optical Data: Biaxial (-), a=1.489, b=1.489, g=1.494, bire=0.0050, 2V(Calc)=0, 2V(Meas)=0.
 

Calculated Properties of Gobbinsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Gobbinsite =2.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGobbinsite = 2.09 barns/electron
U=PEGobbinsite x relectron= 4.53 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 89.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Gobbinsite per GRapi unit = 1.12 (%)

Estimated Radioactivity from Gobbinsite - barely detectable

 

Gobbinsite Classification

Help on  Dana Class: Dana Class: 77.01.03.04 (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.03)Gismondine and related species
 
77.01.03.01 Gismondine Ca2Al4Si4O16•9(H2O) P 21/c 2/m
 
77.01.03.02 Amicite K2Na2Al4Si4O16•5(H2O) I2 2
 
77.01.03.03 Garronite Na2Ca5Al12Si20O64•27(H2O) I 41/a 4/m
 
77.01.03.04 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn21 mm2
 
77.01.03.05 Harmotome (Ba,Na,K)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m
 
77.01.03.06 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m
 
77.01.03.06a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m
 
77.01.03.06b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m
 
77.01.03.08 Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m
 
77.01.03.09 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m
 
77.01.03.09a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m
 
77.01.03.09b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3m 4/m 3 2/m
 
77.01.03.10 Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 63/mmc 6/m 2/m 2/m
 
77.01.03.10a Mazzite-Na! Na8Al8Si28O72•30H2O P 63/mmc 6/m 2/m 2/m
 
77.01.03.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64•23(H2O) I mmm 2/m 2/m 2/m
 
77.01.03.12 Montesommaite (K,Na)9Al9Si23O64•10(H2O) F dd2 mm2
Help on  Strunz Class: Strunz Class: 09.GC.05 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GC -Chains of doubly-connected 4-membered rings
 
09.GC.05 Amicite K2Na2Al4Si4O16•5(H2O) I2 2
 
09.GC.05 Garronite Na2Ca5Al12Si20O64•27(H2O) I 41/a 4/m
 
09.GC.05 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn21 mm2
 
09.GC.05 Gismondine Ca2Al4Si4O16•9(H2O) P 21/c 2/m
 

Other Gobbinsite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Gobbinsite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Gobbinsite

(Na2,Ca)2K2Al6Si10O32•12(H2O)
Dana No: 77.01.03.04 Strunz No: 09.GC.05
Locality:

 

Notes:

 

 
   
 


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