Afwillite Megaw H D Acta Crystallographica 5 (1952) 477-491 The structure of afwillite, Ca3(SiO3OH)2*2H2O Locality: Scawt Hill, Northern Ireland _database_code_amcsd 0009147 16.27 5.632 13.23 90 134.80 90 Cc atom x y z Biso Ca1 .1968 .0348 .2920 1.4 Ca2 .8012 .0485 .2093 1.4 Ca3 .5037 .0362 .0288 1.4 Si1 .1175 .0442 .0007 1.4 Si2 .8692 .9753 .9982 1.4 O1 .9918 .9152 .3410 1.4 OH2 .9992 .9045 .1538 1.4 O3 .7837 .9695 .0207 1.4 OH4 .2158 .0545 .9888 1.4 O5 .3312 .7352 .3905 1.4 O6 .3630 .2820 .4333 1.4 O7 .1473 .2667 .0983 1.4 O8 .1318 .8125 .0778 1.4 Wat9 .5630 .9795 .2583 1.4 Wat10 .4120 .9693 .2647 1.4