Chert (/ˈtʃɜːrt/) is a hard, fine-grained sedimentary rock comp... - dofaq.co
chert

Chert (/ˈtʃɜːrt/) is a hard, fine-grained sedimentary rock comp...

wikipedia - 17 Mar 2022
Chert (/ˈtʃɜːrt/) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz,[1] the mineral form of silicon dioxide (SiO2).[2] Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood.[3]

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