Biotite granite (Charpy emission) (VIDEO) Shinshu University This video is under embargo. Please login to access this video. Caption Biotite granite (Charpy emission) Credit Tsuneaki Yamabe, Faculty of Textile Science and Engineering Technical Staff. Laboratory investigation of earthquake lightning due to landslide, Earth, Planets and Space (2020) 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.