Lewis Short
phengītes (noun M) = φεγγίτης:
* Phengite, selenite, or erystallized gypsum, used for window-panes: in Cappadociā repertus est lapis candidus, atque translucens, ex argumento phengites appellatus,Plin. 36, 22, 46, § 163; lapis,Suet. Dom. 14.
Charlton T. Lewis, Charles Short, A Latin Dictionary