Protomangano-ferro-anthophyllite Sueno S, Matsuura S, Gibbs G V, Boisen M B Physics and Chemistry of Minerals 25 (1998) 366-377 A crystal chemical study of protoanthophyllite: orthoamphiboles with the protoamphibole structure Sample: PMFA Yokene Mine _database_code_amcsd 0008148 9.425 18.303 5.345 90 90 90 Pnmn atom x y z occ Biso FeM1 0 .08795 .5 .88 .60 MgM1 0 .08795 .5 .12 .60 FeM2 0 .17954 0 .752 .58 MgM2 0 .17954 0 .248 .58 FeM3 0 0 0 .835 .57 MgM3 0 0 0 .165 .57 FeM4 0 .26096 .5 .3 .80 MnM4 0 .26096 .5 .7 .80 Si1 .2841 .0838 .1646 .37 Si2 .2952 .1678 .6617 .45 O1 .1127 .0879 .1622 .60 O2 .1235 .1743 .6649 .67 OH3 .1140 0 .6599 .68 O4 .1201 .2566 .1847 .72 O5 .3445 .1234 .4131 .80 O6 .3473 .1244 .9180 .88 O7 .3378 0 .1622 .95