Fayalite Smyth J R, Hazen R M American Mineralogist 58 (1973) 588-593 The crystal structures of forsterite and hortonolite at several temperatures up to 900 C Note: variety hortonolite T = 300 C Locality: Franklin, New Jersey, USA _database_code_amcsd 0000333 4.822 10.456 6.101 90 90 90 Pbnm atom x y z occ Biso Fe1 0 0 0 .582 1.52 Mg1 0 0 0 .339 1.52 Mn1 0 0 0 .079 1.52 Fe2 .9878 .2802 1/4 .518 1.23 Mg2 .9878 .2802 1/4 .411 1.23 Mn2 .9878 .2802 1/4 .071 1.23 Si .4289 .0958 1/4 .96 O1 .7632 .0926 1/4 1.29 O2 .2123 .4514 1/4 1.37 O3 .2853 .1631 .037 1.48