The word lepidolites 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: 17
Highest Scoring Words With Friends™ Play In The Letters lepidolites
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Seven Letter Word Alert: (38 words)
deities, deposit, despite, despoil, dieties, dipoles, dispell, distill, doilies, dollies, dopiest, ellipse, epidote, episode, epistle, idolise, idolist, illites, iodites, iolites, oiliest, oilseed, pelites, pellets, pestled, petiole, pieties, piloted, poetise, posited, sidelit, soliped, spelled, spilled, spoiled, stilled, tellies, topside