al·man·dine (?l?m?n-d?n?) also al·man·dite (-d?t?)n. A deep violet-red garnet, FeAl2Si3O12, found in metamorphic rocks and used as a gemstone.[Alteration of obsolete alabandyne, from Middle English alabandine, from Late Latin (gemma) alabandina, (gem) of Alabanda, from Alabanda, a town of ancient Asia Minor.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.almandine (?ælm?nd?n; -?da?n) n (Minerals) a deep violet-red garnet that consists of iron aluminium silicate and is used as a gemstone. Formula: Fe3Al2(SiO4)3. Also called: almondite [C17: from French, from Medieval Latin alaband?na, from Alabanda, ancient city of Asia Minor where these stones were cut]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014al?man?dine (?æl m?n?din, -?da?n, -d?n) n. a purple-red iron aluminum garnet. [1670?80;