AM_Willhendersonite_1 Formula: K1.537 Ca.987 Al3 Si3 O15.82 H4.68 Name: Willhendersonite Unit cell: 9.205 9.231 9.442 92.55 93.086 90.519 , V=800.29 Space group: P-1 (2)

Fischer R X , Kahlenberg V , Lengauer C L , Tillmanns E , American Mineralogist , 93 (2008) p.1317-1325, Thermal behavior and structural transformation in the chabazite-type zeolite, willhendersonite, KCaAl3Si3O12*5H2O, Locality: Mayen, Eifel district, Germany, Note: T = 373K