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Answer for the clue "Fine-grained rock consisting of compacted clay particles ", 9 letters:
claystone

Word definitions for claystone in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context geology English) sedimentary rock composed of fine, clay particles

WordNet Word definitions in WordNet
n. fine-grained rock consisting of compacted clay particles

Usage examples of claystone.

Iss remembered being wakened by the sound of a metal arrowhead smashing against the claystone grate.