cryptoclastic
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cryp·to·clas·tic
(krĭp′tō-klăs′tĭk)adj.
Composed of microscopic rock fragments.
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.
cryptoclastic
(ˌkrɪptəʊˈklæstɪk)adj
(Minerals) (of minerals and rocks) composed of microscopic fragments
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014