phil·​lips·​ite | \ˈfilə̇pˌsīt\
plural -s

Definition of phillipsite 

: a white or reddish mineral approximately (K2,Na2,Ca)Al2Si4O12.4¹/₂ H2O consisting of a hydrous silicate of potassium, calcium, and aluminum, belonging to the zeolite family, and commonly occurring in complex often cruciform crystals (hardness 4–4.5, specific gravity 2.2)

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History and Etymology for phillipsite

William Phillips †1828 English mineralogist and geologist + English -ite

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