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 = 900 C Locality: Franklin, New Jersey, USA _database_code_amcsd 0000335 4.899 10.419 6.080 90 90 90 Pbnm atom x y z occ Biso Fe1 0 0 0 .564 1.02 Mg1 0 0 0 .359 1.02 Mn1 0 0 0 .077 1.02 Fe2 .9876 .2797 1/4 .536 .81 Mg2 .9876 .2797 1/4 .391 .81 Mn2 .9876 .2797 1/4 .073 .81 Si .4284 .0957 1/4 .69 O1 .7649 .0921 1/4 .98 O2 .2135 .4524 1/4 .91 O3 .2847 .1631 .0375 1.04