Figure 2 (IMAGE) Moscow Institute of Physics and Technology Caption Hard and superhard materials on the "treasure map". The horizontal position of a symbol reflects its fracture resistance and its vertical position reflects its Vickers hardness. Black symbols represent known materials, blue ones represent new materials; symbols marked by a red spot indicate materials that are stable at ambient conditions Credit Alexander G. Kvashnin, Journal of Applied Physics Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.