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Thornasite

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
(Na,K)12Th3[Si8O19]4·18H2O
Strunz: 
9.GF.50
Physical Properties
Hardness: 
0.0