The word wollastonite 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™ Plays In The Letters wollastonite
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Seven Letter Word Alert: (46 words)
altoist, elastin, elation, entails, entwist, install, instate, isolate, latents, latites, leantos, lentils, lintels, lionets, loonies, lotions, nailset, oleosin, oolites, otolite, owliest, salient, sealion, station, stollen, stoolie, swollen, talents, tallest, tallies, tallows, toenail, toilets, toolset, toonies, tootles, tootsie, towline, twinset, twonies, twoonie, wallets, wattles, woolens, woolies, woollen