Tremolite Warren B Zeitschrift fur Kristallographie 72 (1930) 493-516 The crystal structure and chemical composition of the monoclinic amphiboles. _cod_database_code 1011146 _database_code_amcsd 0018031 9.78 17.79999 5.26 90 73.97 90 I2/m atom x y z O1 .14 .08 .1 O2 .14 0 -.4 O3 .14 .18 -.4 O4 .14 .25 .1 O5 .14 .36 -.25 O6 .14 .39 .25 O7 .14 .5 -.4 Ca1 0 .28 .5 Mg1 0 .09 .5 Mg2 0 .17 0 Mg3 0 0 0 Si1 .29 .08 .01 Si2 .29 .18 -.49