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Gonnardite

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Formula:
(Na,Ca)2(Si,Al)5O10 · 3H2O
System:
Orthorhombic
Hardness:
4 - 5
Name:
For French mineralogist Ferdinand Gonnard (1833-1923).
Zeolite Group. Natrolite Subgroup.

The compositions of and structural relationships between gonnardite and tetranatrolite remain controversial (Artioli and Galli 1999; Evans et al. 2000; Ross et al. 1992; Lee et al. 2006).


Classification of Gonnardite

Approved, 'Grandfathered' (first described prior to 1959)
9.GA.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites
77.1.5.7

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.10.5

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis

Type Occurrence of Gonnardite

Physical Properties of Gonnardite

Hardness (Mohs):
4 - 5

Crystallography of Gonnardite

Crystal System:
Orthorhombic
Cell Parameters:
a = 13.38Å, b = 13.38Å, c = 6.66Å
Ratio:
a:b:c = 1 : 1 : 0.498
Unit Cell Volume:
V 1,192.30 ų (Calculated from Unit Cell)
Comment:
Also space group I-42d, a = 13.21(1), c = 6.622(4) A.

Optical Data of Gonnardite

Type:
Biaxial (+)
RI values:
nα = 1.514 nβ = 1.515 nγ = 1.520
2V:
Measured: 52° , Calculated: 50°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
strong

Chemical Properties of Gonnardite

Formula:
(Na,Ca)2(Si,Al)5O10 · 3H2O
All elements listed in formula:

Relationship of Gonnardite to other Species

Other Members of Group:
MesoliteNa2Ca2Si9Al6O30 · 8H2O
NatroliteNa2Al2Si3O10 · 2H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
ScoleciteCaAl2Si3O10 · 3H2O
TetranatroliteFormerly in Zeolite Group, Natrolite Subgroup.
9.GA.05MesoliteNa2Ca2Si9Al6O30 · 8H2O
9.GA.05NatroliteNa2Al2Si3O10 · 2H2O
9.GA.05ParanatroliteNa2Al2Si3O10 · 3H2O
9.GA.05ScoleciteCaAl2Si3O10 · 3H2O
9.GA.10Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
9.GA.10Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
9.GA.15EdingtoniteBa[Al2Si3O10] · 4H2O
9.GA.15KalborsiteK6Al4BSi6O20(OH)4Cl
16.10.1Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
16.10.2LisetiteCaNa2Al4Si4O16
16.10.4Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
16.10.6MesoliteNa2Ca2Si9Al6O30 · 8H2O
16.10.7Faujasite
16.10.8Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
16.10.9BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
16.10.10Herschelite(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
16.10.11Phillipsite
16.10.12Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O
16.10.13WillhendersoniteKCa[Al3Si3O12] · 5H2O
16.10.14Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
16.10.15Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
16.10.16Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O
16.10.17Lévyne
16.10.18Clinoptilolite
16.10.19Heulandite
16.10.20GobbinsiteNa5(Si11Al5)O32 · 11H2O
16.10.21Stilbite
16.10.22Dachiardite
16.10.23OffretiteKCaMg(Si13Al5)O36 · 15H2O
16.10.24PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
16.10.25Erionite
16.10.26Paulingite
16.10.27Sodium Dachiardite(Na2,Ca,K2)4-5Al8Si40O96 · 26H2O
16.10.28Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
16.10.29RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O

Other Names for Gonnardite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Gonnardite

Reference List:
Mazzi, F., A.O. Larsen, G. Gottardi, and E. Galli (1986) Gonnardite has the tetrahedral framework of natrolite: experimental proof with a sample from Norway. Neues Jahrb. Mineral., Monatsh., 219-228.

Nawaz, R. (1988) Gonnardite and disordered natrolite-group minerals: their distinction and relations with mesolite, natrolite and thomsonite. Mineral. Mag., 52, 207-219.

Mineralogical Magazine (1998): 62: 548.

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

Evans, H.T., Konnert, J.A., and Ross, M. (2000) The crystal structure of tetranatrolite from Mont Saint-Hilaire, Quebec, and its chemical and structural relationship to paranatrolite and gonnardite. American Mineralogist 85, 1808-1815.

Kol’tsova, T. N. (2005) Zeolites of the natrolite-thomsonite series. Inorganic Materials, 41, 750-756.

Lee, Yongjae, Hriljac, Joseph A., Parise, John B., and Vogt, Thomas (2006) Pressure-induced hydration in zeolite tetranatrolite. American Mineralogist 91, 247-251.

Internet Links for Gonnardite

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http://www.mindat.org/min-1724.html
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Specimens:
The following Gonnardite specimens are currently listed for sale on minfind.com.

Localities for Gonnardite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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