Chert (/ˈtʃɜːrt/) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2).
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Chert is a type of rock that includes flint and agate. It sometimes has fossils in it, usually shells. It is a sedimentary rock, and it is very hard.
The main article for this category is Chert. Subcategories. This category has the following 3 subcategories, out of 3 total.
The Rhynie chert is a Lower Devonian sedimentary deposit exhibiting extraordinary fossil detail or completeness (a Lagerstätte). ... It is exposed near the ...