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A visit to Arkansas’ Crater of Diamonds State Park turned out to profitable for Susie Clark when she found a diamond the size of pinto bean. She says she plans to keep the diamond and since she found it after saying a prayer, she calls it “Hallelujah Diamond.” Clark says she first visited the park with…

Diamond loses its stiffness crown to new material 16:22 02 February 2007 A material that is stiffer than diamond has been created by mixing particles of the mineral barium titanate and molten tin. Diamond was previously the stiffest material known. The new material was made by a team from Washington…