Dictionary
mi•ca
Pronunciation: (mī'ku), [key]—
n.
any member of a group of minerals, hydrous silicates of aluminum with other bases, chiefly potassium, magnesium, iron, and lithium, that separate readily into thin, tough, often transparent, and usually elastic laminae; isinglass.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.