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Herschelite: (Na,Ca,K)AlSi2O6·3(H2O) Chabazite-Na: (Na2,K2,Ca,Mg)[Al2Si4O12]·6(H2O)
Comments: Rounded transparent crystals of chabazite-Na (herschelite). Location: Horseshoe Dam, Maricopa County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals