Si24 Open Framework (IMAGE) Carnegie Institution for Science Caption The new Si24 allotrope has an open-framework structure comprised of 5-, 6- and 8-membered sp3-bonded silicon rings. Credit Duck Young Kim Usage Restrictions With credit 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.