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Use "cherts" in a sentence
"The energy released created chocolate tablet boudinage in cherts, and their association with distally situated ring thrusts is also thought to be unique."
"Among the targets: carbonates, cherts and opals - all characteristic of thermal hot springs."
"Approximately 98.5% of the pebbles are flints and cherts, the remainder are composed of limestones, vein quartz, porphyry, igneous materials and quartzites."