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pelitic

pelitic, a. Geol.
  (pɪˈlɪtɪk)
  [f. prec. + -ic.]
  Of the nature of pelite; composed of fine sediment.

1879 Rutley Study Rocks xiv. 299 The clastic rocks..he divides into the psephitic, the psammitic, and the pelitic.

Oxford English Dictionary

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