phillipsite
/ˈfɪlɪpsʌɪt/Mineralogy
noun
A mineral of the zeolite group which has the composition KCa(Si5Al3)O16.6H2O, belongs to the monoclinic crystal system, and occurs as colourless, reddish, or yellowish twinned crystals, often forming spherulites or crusts.
Origin
Early 19th century. From the name of William Phillips, English mineralogist and geologist + -ite.
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