Tags: Chemical Substance, Mineral.
Phillipsite is a mineral series of the zeolite group; a hydrated potassium calcium and aluminium silicate approximating to (CaNa2K2)3Al6Si10O32·12H2O. The members of the series are phillipsite-K phillipsite-Na and phillipsite-Ca. The crystals are monoclinic but only complex cruciform twins are known these being exactly like twins of harmotome which also forms a series with phillipsite-Ca.
