The Structures of NaCl (IMAGE) Moscow Institute of Physics and Technology Caption The structures of 'textbook' NaCl (left) and 'forbidden' A3Y (A=Li, Na, K; Y= Cl, Br) (right) are shown. Credit MIPT press office 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.