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 = 25 C Locality: Franklin, New Jersey, USA _database_code_amcsd 0000332 4.798 10.387 6.055 90 90 90 Pbnm atom x y z occ Biso Fe1 0 0 0 .562 .44 Mg1 0 0 0 .361 .44 Mn1 0 0 0 .077 .44 Fe2 .9867 .2792 1/4 .538 .33 Mg2 .9867 .2792 1/4 .389 .33 Mn2 .9867 .2792 1/4 .073 .33 Si .4287 .0957 1/4 .33 O1 .7661 .0918 1/4 .49 O2 .2127 .4514 1/4 .50 O3 .2844 .1633 .0357 .55