hohmannite

hohmannite

[′hō·mə‚nīt]
(mineralogy)
Fe2(SO4)2(OH)2·7H2O A chestnut brown to burnt orange and amaranth red, triclinic mineral consisting of a hydrated basic sulfate of iron.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.