Proustite is a 9 letter English word. It's valid Words with friends word worth 13 points.
You can make 589 anagrams from letters in proustite (eioprsttu).
1825-35; named after J. L. Proust; see -ite1
I might possibly offer to change some of the locally interesting ones for a proustite, but I can't afford any more cash just now.