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.