Answer: chert

AnswerCrossword Clue
CHERT

Rock found in limestone beds

CHERT

Rock like flint

CHERT

Fine-grained silica

CHERT
Flintlock rock
CHERT
Kind of quartz.
CHERTFlintlike quartz.
CHERTDull-colored flintlike quartz.
CHERTFlint-like rock.
CHERTFine-grained rock
CHERTQuartz
CHERTFlintlike rock