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Tetranatrolite: Na2[Al2Si3O10]·2(H2O) Gonnardite: Na2CaAl4Si6O20·7(H2O)
Comments: White, pseudocubic crystals of tetranatrolite (gonnardite) on matrix. Location: Point of Rocks Mesa, Colfax County, New Mexico, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals