KnowraChertLinked fromLinked fromThe 7 pages that link to Chert, each with the reason it gives.All 7Broader topic 2Related 2Compared with 3ObsidianCompared with: Chert can resemble obsidian as a toolstone, but lacks its glassy volcanic structure.ChalkCompared with: Chert nodules can occur within chalk, but their silica composition makes them much harder.Carbonate rockCompared with: It can occur within carbonate sequences but is not carbonate rock.