mica book

mica book

[′mī·kə ‚bu̇k]
(mineralogy)
A crystal of mica, usually large and irregular, whose cleavage plates resemble the leaves of a book. Also known as book.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Moreover, the successful selection, splitting, and knife-trimming of mica books requires skills acquired only through direct practical experience.