phillipsite

[fil-ip-sahyt]

noun

a zeolite mineral, similar to stilbite but with potassium replacing some of the calcium.

Origin of phillipsite

1815–25; named after J. W. Phillips (1775–1828), English mineralogist; see -ite¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Crystals of zeolites (phillipsite) form in the red-clay as radiate, nodular groups.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4
Various
Morvenite (from Morven in Argyllshire) is the name given to small transparent crystals formerly referred to as phillipsite.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 1
Various