lithium carbonate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A white granular powder, Li₂CO₃, used as a drug primarily to treat bipolar disorder and in the manufacture of glass and ceramics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry The lithium salt of carbonic acid, Li2CO3, used in the manufacture of glass and ceramics, and medically, in the treatment of bipolar disorder.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a white powder (LiCO3) used in manufacturing glass and ceramics and as a drug; the drug (trade names Lithane or Lithonate or Eskalith) is used to treat some forms of depression and manic episodes of manic-depressive disorder