Very fragile, will break if dropped, or even bent slightly, discovered a 1 inch thick, over 50 inches long sheet of this buried, and STUCK to the dirt of a hill in California. Shiny if you cannot notice on and almost has stuff like crystal bars sticking up out of it. IMAGE: http://i41.tinypic.com/6xu90m.jpg, Can someone tell me what type of crystal, or rock this is, and if it has any value? Thanks.