Ilvaite Ghose S, Hewat A W, Marezio M Physics and Chemistry of Minerals 11 (1984) 67-74 A neutron powder diffraction study of the crystal and magnetic structures of ilvaite from 305 K to 5 K - a mixed valence iron silicate with an electronic transition Sample: T = 305 K _database_code_amcsd 0007364 13.0207 8.8121 5.8609 90 90.249 90 P2_1/a atom x y z occ Biso Ca .8092 .3662 .7558 1.63 FeM11 .8890 .0494 .0095 .95 .63 MnM11 .8890 .0494 .0095 .05 .63 FeM12 .8900 .0548 .4903 .95 .63 MnM12 .8900 .0548 .4903 .05 .63 FeM2 .9406 .7396 .2481 .85 .00 MnM2 .9406 .7396 .2481 .15 .00 Si1 .9585 .3669 .2451 1.57 Si2 .6785 .2260 .2464 1.57 O1 .0085 .0306 .7309 1.57 O21 .9348 .2736 .0106 1.57 O22 .9363 .2751 .4795 1.57 O5 .5854 .1004 .2605 1.57 O6 .6006 .0214 .7543 1.57 O3 .7770 .1098 .2545 1.57 O41 .6721 .3277 .0191 1.57 O42 .6709 .3320 .4771 1.57 O7 .7963 .1069 .7492 1.57 H .7355 .0621 .7402 3.06