roesslerite

roesslerite

[′res·lə‚rīt]
(mineralogy)
MgH(AsO4)·7H2O A monoclinic mineral composed of hydrous acid magnesium arsenate; it is isomorphous with phosphorroesslerite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.