Chert

Chert (dark bands) in the Devonian Corriganville-New Creek limestone, Everett, Pennsylvania

Chert layer (prominent band near top of outcrop) in the Eocene Ping Tau Formation, Hong Kong

Chert (/ˈtʃɜːrt/) is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color (from white to black), but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green are most often related to traces of iron (in its oxidized and reduced forms respectively).

单词	Chirt
释义	Chirt 英语百科 Chert Chert (/ˈtʃɜːrt/) is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color (from white to black), but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green are most often related to traces of iron (in its oxidized and reduced forms respectively).
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Chirt

Chert