Braunite Miletich R, Allan D R, Angel R J Physics and Chemistry of Minerals 25 (1998) 183-192 Structural control of polyhedral compression in synthetic braunite, Mn2+Mn3+6O8SiO4 Sample: P = 5.63 GPa _database_code_amcsd 0008128 9.3309 9.3309 18.5455 90 90 90 *I4_1/acd 0 -.25 .125 atom x y z Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Mn1 0 .25 1/8 1.20 .00322 .00322 .00094 -.00051 0 0 Mn2 0 0 0 .88 .00218 .00248 .00073 -.00065 -.00013 .00006 Mn3 .25 .21645 0 .77 .00220 .00179 .00068 0 .00028 0 Mn4 .23277 .48277 1/8 .90 .00249 .00249 .00071 -.00003 .00004 .00004 Si 0 .25 3/8 .94 .00240 .00240 .00083 0 0 0 O1 .15033 .85425 .94610 .95 O2 .14437 .07238 .05742 .93 O3 .08029 .13196 .92564 .98