The word cobaltites 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 cobaltites
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Seven Letter Word Alert: (34 words)
albites, alecost, aloetic, altoist, astilbe, batlets, battles, betoils, biotest, blastic, bottles, castile, celosia, citable, coalise, coalite, cobalts, costate, elastic, iceboat, isolate, laciest, lactose, latites, lattice, libates, locates, setbolt, statice, stoical, tablets, tactile, toilets, totable