melanostibian

melanostibian

[‚mel·ə·nō′stib·ē·ən]
(mineralogy)
Mn(Sb,Fe)O3 A black mineral consisting of iron and manganese antimonite; occurs as foliated masses and as striated crystals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.