Gonnardite Mineral Data

General Gonnardite Information

Chemical Formula:

Na2CaAl4Si6O20•7(H2O)

Composition:

Molecular Weight = 808.59 gm

Sodium 5.69 % Na 7.67 % Na₂O

Calcium 4.96 % Ca 6.94 % CaO

Aluminum 13.35 % Al 25.22 % Al₂O₃

Silicon 20.84 % Si 44.58 % SiO₂

Hydrogen 1.75 % H 15.60 % H₂O

Oxygen 53.42 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂CaAl₄Si₆O₂₀•7(H₂O)

Environment:

Secondary mineral in basalts.

IMA Status:

Valid Species (Pre-IMA) 1896

Locality:

Gignat, Puy-de-Dome, France. Link to MinDat.org Location Data.

Name Origin:

Named for Ferdinand Gonnard, French mineralogist, Lyons, France.

Name Pronunciation:

Gonnardite + Pronunciation

Synonym:

ICSD 29522

PDF 45-1324

Tetranatrolite

Gonnardite Image

Images:

Gonnardite

Comments: White spherical aggregates of gonnardite on matrix.
Location: White spherical aggregates of Gonnardite on matrix. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Tetranatrolite Gonnardite

Comments: White, pseudocubic crystals of tetranatrolite (gonnardite) on matrix.
Location: Point of Rocks Mesa, Colfax County, New Mexico, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Gonnardite Crystallography

Axial Ratios:

a:c = 1:0.50128

Cell Dimensions:

a = 13.21, c = 6.622, Z = 2; V = 1,155.57 Den(Calc)= 2.32

Crystal System:

Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42d

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

By Intensity(I/I_o): 2.92(1), 5.93(0.8), 4.44(0.6),

Physical Properties of Gonnardite

Cleavage:

{???} Perfect

Color:

White.

Density:

2.3

Diaphaneity:

Transparent to translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Gonnardite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2226,KPDmeas= 0.2245,KC= 0.2271
Ncalc = 1.52 - 1.53

Optical Data:

Biaxial (+), a=1.514, b=1.515, g=1.52, bire=0.0060, 2V(Calc)=50, 2V(Meas)=52.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Gonnardite

Electron Density:

Bulk Density (Electron Density)=2.32 gm/cc
note: Specific Gravity of Gonnardite =2.30 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Gonnardite= 1.92 barns/electron
U=PE_Gonnardite x rElectron Density= 4.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gonnardite is Not Radioactive

Gonnardite Classification

Dana Class:

77.01.05.07 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.05)Natrolite and related species

77.01.05.01 Natrolite Na2[Al2Si3O10]•2(H2O) F dd2 mm2

77.01.05.02 Tetranatrolite? Na2[Al2Si3O10]•2(H2O) I 42d 4 2m

77.01.05.03 Paranatrolite Na2[Al2Si3O10]•3(H2O) Cc m

77.01.05.04 Mesolite Na2Ca2Al6Si9O30•8(H2O) C 2 2

77.01.05.05 Scolecite CaAl2Si3O10•3(H2O) Cc m

77.01.05.06 Edingtonite BaAl2Si3O10•4(H2O) P 2₁2₁2 2 2 2

77.01.05.07 Gonnardite Na2CaAl4Si6O20•7(H2O) I 42d 4 2m

77.01.05.08 Cowlesite CaAl2Si3O10•5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

77.01.05.09 Thomsonite-Ca NaCa2Al5Si5O20•6(H2O) Pncn 2/m 2/m 2/m

77.01.05.10 Thomsonite-Sr! (Sr,Ca)2Na[Al5Si5O20]•7(H2O) Pcnn 2/m 2/m 2/m

77.01.05.11 Nabesite! Na2BeSi4O10•4(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

09.GA.05 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GA -Zeolites with T5O10 Units ï¿½ The Fibrous Zeolites

09.GA.05 Gonnardite Na2CaAl4Si6O20•7(H2O) I 42d 4 2m

09.GA.05 Mesolite Na2Ca2Al6Si9O30•8(H2O) C 2 2

09.GA.05 Natrolite Na2[Al2Si3O10]•2(H2O) F dd2 mm2

09.GA.05 Paranatrolite Na2[Al2Si3O10]•3(H2O) Cc m

09.GA.05 Scolecite CaAl2Si3O10•3(H2O) Cc m

09.GA.05 Tetranatrolite? Na2[Al2Si3O10]•2(H2O) I 42d 4 2m

Other Gonnardite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Gonnardite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Gonnardite

Na2CaAl4Si6O20•7(H2O)
Dana No: 77.01.05.07 Strunz No: 09.GA.05
Locality:

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