pelitic

pelite

[pee-lahyt]
noun Geology.
any clayey rock, as mudstone or shale.

Origin:
1875–80; < Greek pēl(ós) clay, earth + -ite1

pelitic [pi-lit-ik] , adjective
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World English Dictionary
pelite (ˈpiːlaɪt)
 
n
any argillaceous rock such as shale
 
[C19: from Greek pēlos mud]
 
pelitic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pelite   (pē'līt')  Pronunciation Key 
A sediment or sedimentary rock composed of fine fragments, as of clay or mud.
The American Heritage® Science Dictionary
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