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Treasure Hunting For Fire Agates - By: David Cowley, 2008-07-03 Fire Agates is a layered stone that is formed then water that is saturated with colloida silica and iron oxide enters a cavity in a rock and the mineral in the water starts do form new rock. When cutting, the stones layers are ground or polished off following the natural contours of the stone until the desired colored is all that is left. Grind off one to many layers and the stone is ruined. COMMENTS Add a comment |