phillipsite
noun
phil·lips·ite
ˈfilə̇pˌsīt
plural -s
: 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)
Word History
Etymology
William Phillips †1828 English mineralogist and geologist + English -ite