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Saponite: (Ca/2,Na)0,3(Mg,Fe++)3(Si,Al)4O10(OH)2·4(H2O)
Comments: Light brown saponite pseudomorphs after stilbite crystals up to 6 mm. Location: Thetford Mines, Mégantic Co., Québec, Canada. Scale: 25x25x12 mm. © John Betts - Fine Minerals