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 = 600 C Locality: Franklin, New Jersey, USA _database_code_amcsd 0000334 4.838 10.492 6.136 90 90 90 Pbnm atom x y z occ Biso Fe1 0 0 0 .583 2.37 Mg1 0 0 0 .338 2.37 Mn1 0 0 0 .079 2.37 Fe2 .994 .2799 1/4 .517 1.69 Mg2 .994 .2799 1/4 .412 1.69 Mn2 .994 .2799 1/4 .071 1.69 Si .445 .0959 1/4 1.06 O1 .814 .0882 1/4 2.64 O2 .210 .4503 1/4 .89 O3 .280 .1615 .0447 1.84