weibullite

weibullite

[′wī‚bu̇‚līt]
(mineralogy)
Pb4Bi6S9Se4 A steel gray mineral consisting of lead bismuth sulfide with selenium replacing the sulfide; occurs in indistinct prismatic crystals in massive form.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.