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• Chert - Wikipedia, the free encyclopedia

  Chert (pronounced /ˈtʃɝt/) is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils.

• Chert

  Chert pebbles from California. ... Chert (c) 2001 Andrew Alden, licensed to About.com, Inc. (fair use policy)

• chert definition |Dictionary.com

  noun . a compact rock consisting essentially of microcrystalline quartz.