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Gaidonnayite

Type Locality
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Mineral Data
Na2Zr(Si3O9)·2H2O
Strunz: 
9.DM.15
Physical Properties
Crystal System: 
Orthorhombic
Streak: 
White
Hardness: 
5.0 - 0.0
Tenacity: 
brittle