AM_Li5Al5Si15O4
Formula: Li.25 (Si.75 Al.25) O2
Name: Li.5Al.5Si1.5O4
Unit cell: 5.1609 5.1609 5.4574 90.0 90.0 120.0 , V=125.88
Space group: P6222 (180)

Xu H , Heaney P J , Beall G H , American Mineralogist , 85 (2000) p.971-979, Phase transitions induced by solid solution in stuffed derivatives of quartz:, A powder synchrotron XRD study of the LiAlSiO4-SiO2 join, Sample: x=.50, Li.5Al.5Si1.5O4, beta quartz structure