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cryptoclastic

adjective
cryp·​to·​clas·​tic | \¦kriptə¦klastik\

Definition of cryptoclastic 

of a rock

: made up of microscopic fragmental particles

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First Known Use of cryptoclastic

1879, in the meaning defined above

History and Etymology for cryptoclastic

International Scientific Vocabulary crypt- + clastic; originally formed as German kryptoklastisch

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The first known use of cryptoclastic was in 1879

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