Structure of Epistilbite

Abstract

AFTER the determination of the related structures of mordenite¹ and dachiardite², attempts were made to find other related frameworks³ corresponding to known minerals. Continuing this work, it appears that a modification of the mordenite chains results in a structure fitting the requirements of epistilbite. Figs. 1A and B show the arrangement—observing the usual convention of indicating only silicon and aluminium atoms which fall at the corners, while the oxygens of the framework lie close to the mid-points of each line. Fig. 1A shows the structure projected down the a-axis, which owing to superposition of certain vertical bonds should be interpreted with the assistance of Fig. 1B showing a single layer seen along the b-axis.