Definition for Revision history of "Chert"

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  • (cur | prev) 18:31, 3 October 2013Robertling (Talk | contribs). . (451 bytes) (+451). . (Created page with "Chert 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...")