AM_Heulandite-Sr_4 Formula: Sr1.73 (Si13.5 Al4.5) O44.3 H21.04 Name: Heulandite-Sr Unit cell: 17.6 17.59 7.408 90.0 116.76 90.0 , V=2047.78 Space group: C1M1 (8)

Dobelin N , Armbruster T , American Mineralogist , 88 (2003) p.527-533, Stepwise dehydration of Sr-exchanged heulandite:, A single-crystal X-ray study, Note: dehydrated at 250 deg C, measured at -170 deg C