beraunite
beraunite
[bə′rau̇‚nīt] (mineralogy)
Fe2+Fe3+(PO4)3(OH)5·3H2O A reddish-brown to blood red, monoclinic mineral consisting of hydrated basic phosphate of ferric and ferrous iron.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.