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(Na,Ca)2(Si,Al)5O10 · 3H2O
4 - 5
Member of:
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 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
A : Zeolites with T5O10 Units – The Fibrous Zeolites

1 : Zeolite group - True zeolites

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

Optical Data of Gonnardite

Biaxial (+)
RI values:
nα = 1.514 nβ = 1.515 nγ = 1.520
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:

Chemical Properties of Gonnardite

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

Relationship of Gonnardite to other Species

Member of:
Other Members of Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2O
AmiciteK2Na2Al4Si4O16 · 5H2O
AnalcimeNa(AlSi2O6) · H2O
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O
BikitaiteLiAlSi2O6 · H2O
BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2O
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
Erionite-Ca(Ca,K2,Na2)2[Al4Si14O36] · 15H2O
Erionite-K(K2,Ca,Na2)2[Al4Si14O36] · 15H2O
Erionite-Na(Na2,K2,Ca)2[Al4Si14O36] · 15H2O
Faujasite-Ca(Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2O
Faujasite-Mg(Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2O
Faujasite-Na(Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2O
Ferrierite-K(K2,Na2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Mg(Mg,Na2,K2,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Na(Na2,K2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
GaultiteNa4Zn2Si7O18 · 5H2O
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
Gmelinite-CaCa2(Si8Al4O24] · 11H2O
Gmelinite-KK4(Si8Al4O24) · 11H2O
Gmelinite-NaNa4(Si8Al4O24] · 11H2O
GobbinsiteNa5(Si11Al5)O32 · 11H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Heulandite-Ba(Ba,Ca,K)5(Si27Al9)O72 · 22H2O
Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Heulandite-K(K,Ca,Na)5(Si27Al9)O72 · 26H2O
Heulandite-Na(Na,Ca,K)6(Si,Al)36O72 · 22H2O
Heulandite-Sr(Sr,Na,Ca)5(Si27Al9)O72 · 24H2O
LaumontiteCaAl2Si4O12 · 4H2O
LovdariteK2Na6Be4Si14O36 · 9H2O
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
Mazzite-NaNa8[Al4Si14O36]2 · 30H2O
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
MesoliteNa2Ca2Si9Al6O30 · 8H2O
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
NatroliteNa2Al2Si3O10 · 2H2O
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
Phillipsite-Ca(Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32 . 12H2O
Phillipsite-K(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O
Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
ScoleciteCaAl2Si3O10 · 3H2O
StelleriteCa4(Si28Al8)O72 · 28H2O
Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2O
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2O
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2O
WairakiteCa(Al2Si4O12) · 2H2O
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2O
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O
WillhendersoniteKCa[Al3Si3O12] · 5H2O
YugawaraliteCaAl2Si6O16 · 4H2O
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
16.10.4Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
16.10.6MesoliteNa2Ca2Si9Al6O30 · 8H2O
16.10.8Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
16.10.9BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
16.10.10Herschelite(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
16.10.12Fedorite(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
16.10.20GobbinsiteNa5(Si11Al5)O32 · 11H2O
16.10.23OffretiteKCaMg(Si13Al5)O36 · 15H2O
16.10.24PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
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 URL:
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Localities for Gonnardite

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