Phacoid :: Phacoid (a.) Resembling a lentil; lenticular.
Phacolite :: Phacolite (n.) A colorless variety of chabazite; the original was from Leipa, in Bohemia..
Phacops :: Phacops (n.) A genus of trilobites found in the Silurian and Devonian formations. Phacops bufo is one of the most common species.