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Heulandite-Ca: (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O)
Comments: Crystals of heulandite with a green color due to chlorite inclusions. Location: Malagaon, India. Scale: 5 x 4.5 x 3 cm. © Isaias Casanova / IC Minerals
Heulandite-Ca: (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) Mordenite: (Ca,Na2,K2)Al2Si10O24·7(H2O)
Comments: White, acicular crystals of mordenite in heulandite geode. Location: Rock Creek, Stevenson, Skamania County, Washington, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Comments: Pink heulandite crystals up to 15 mm in fibrous white mordenite matrix. Location: Rats Nest Claim, Challis, Custer Co., Idaho, USA. Scale: 6x6x4 cm. © John Betts - Fine Minerals