MICA

Yes. "MICA" is in the ENABLE word list, accepted by Words With Friends and most open Scrabble apps. It scores 8 points in Scrabble and 10 points in Words With Friends.

In Scrabble, "MICA" is worth 8 points before bonuses. In Words With Friends, it's worth 10 points. Played on a triple-word-score, the Scrabble value becomes 24.

Any of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.

No, "MICA" has no anagrams in the ENABLE dictionary — it's the only word that can be formed from its exact letters.