The word chrysotile is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (33 words)
chortle, cithers, clerisy, clothes, cloyers, coheirs, colters, coltish, cotyles, erotics, estriol, heroics, history, holiest, holster, horsily, hosiery, hostile, hostler, isohyet, loiters, ostrich, recoils, rhotics, richest, schorly, scyther, shortly, slither, society, stylier, toilers, torches