Lawsonite Comodi P, Zanazzi P F American Mineralogist 81 (1996) 833-841 Effects of temperature and pressure on the structure of lawsonite P = 28.7 kbar, T = 23 C _database_code_amcsd 0001802 8.717 5.805 13.036 90 90 90 Ccmm atom x y z Uiso Ca .3322 0 .25 .0122 Al .25 .25 0 .0073 Si .9797 0 .1334 .0084 O1 .051 0 .25 .0054 O2 .3776 .273 .1179 .011 O3 .1370 0 .0644 .012 O4 .6358 0 .0475 .0120 O5 .610 0 .25 .019