tapiolite

tapiolite

[′tap·ē·ə‚līt]
(mineralogy)
Fe(Ta,Nb)2O6 A mineral that is isomorphous with mossite; occurs in pegmatites or detrital deposits; an ore of tantalum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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as a submicroscopic mixture of cassiterite and tapiolite) occurs as apparently well-formed crystals, randomly or preferentially oriented, in groups to 10 cm across.