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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

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

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

Usage examples of claystone.

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