enigmatite

enigmatite

[ə′nig·mə‚tīt]
(mineralogy)
Na2Fe5TiSi6O20 A black amphibole mineral occurring in triclinic crystals; specific gravity is 3.14-3.80. Also spelled aenigmatite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.