manganosite
manganosite
[‚maŋ·gə′nō‚sīt] (mineralogy)
MnO An emerald-green isometric mineral occurring in small octahedrons that blacken on exposure; hardness is 5-6 on Mohs scale, and specific gravity is 5.18.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.