Gonnardite Mineral Data

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.

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:

Gonnardite Tetranatrolite

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 - ScalenohedralH-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),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Artioli G , Galli E , American Mineralogist , 84 (1999) p.1445-1450, Gonnardite: Re-examination of holotype material, and discreditation of, tetranatrolite

View Additional jPOWD Structure files for Gonnardite
[1] [2] [3] [4]

Physical Properties of Gonnardite

Cleavage:

[???] Perfect

Color:

White.

Density:

2.3

Diaphaniety:

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

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:

r_electron=2.32 gm/cc
note: r_Gonnardite=2.30 gm/cc.

Fermion Index

Fermion Index = 0.01005
Boson Index = 0.98995

Photoelectric:

PE_Gonnardite= 1.92 barns/electron
U=PE_Gonnardite x r_electron= 4.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gonnardite is Not Radioactive

Gonnardite Classification

Dana Class:

77.1.5.7 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.5)Natrolite and related species

77.1.5.1 Natrolite Na2[Al2Si3O10]·2(H2O) F dd2 mm2

77.1.5.2 Tetranatrolite? Na2[Al2Si3O10]·2(H2O) I 42d 4 2m

77.1.5.3 Paranatrolite Na2[Al2Si3O10]·3(H2O) Cc m

77.1.5.4 Mesolite Na2Ca2Al6Si9O30·8(H2O) C 2 2

77.1.5.5 Scolecite CaAl2Si3O10·3(H2O) Cc m

77.1.5.6 Edingtonite BaAl2Si3O10·4(H2O) P 2₁2₁2 2 2 2

77.1.5.7 Gonnardite Na2CaAl4Si6O20·7(H2O) I 42d 4 2m

77.1.5.8 Cowlesite CaAl2Si3O10·5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

77.1.5.9 Thomsonite-Ca NaCa2Al5Si5O20·6(H2O) Pncn 2/m 2/m 2/m

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

77.1.5.11 Nabesite! Na2BeSi4O10·4(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

VIII/J.21-40 VIII - Silicates

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

VIII/J.21 - Zeolite group, Natrolite - Thomsonite series

VIII/J.21-10 Natrolite Na2[Al2Si3O10]·2(H2O) F dd2 mm2

VIII/J.21-20 Paranatrolite Na2[Al2Si3O10]·3(H2O) Cc m

VIII/J.21-30 Tetranatrolite? Na2[Al2Si3O10]·2(H2O) I 42d 4 2m

VIII/J.21-40 Gonnardite Na2CaAl4Si6O20·7(H2O) I 42d 4 2m

VIII/J.21-50 Mesolite Na2Ca2Al6Si9O30·8(H2O) C 2 2

VIII/J.21-60 Scolecite CaAl2Si3O10·3(H2O) Cc m

VIII/J.21-70 Thomsonite-Ca NaCa2Al5Si5O20·6(H2O) Pncn 2/m 2/m 2/m

VIII/J.21-80 Thomsonite-Sr! (Sr,Ca)2Na[Al5Si5O20]·7(H2O) Pcnn 2/m 2/m 2/m

Other Gonnardite Information

References:

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

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Gonnardite

Na2CaAl4Si6O20·7(H2O)
Dana No: 77.1.5.7 Strunz No: VIII/J.21-40
Locality:

Notes: