orthoclastic

or·tho·clas·tic

 (ôr′thə-klăs′tĭk)

adj. Geology

Having right-angled cleavage.

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.