Ilvaite Carrozzini B European Journal of Mineralogy 6 (1994) 465-479 Crystal structure refinements of ilvaite: new relationships between chemical composition and crystallographic parameters Sample: Rio Marina X _database_code_amcsd 0006544 13.012 8.809 5.849 90 90.02 90 P2_1/a atom x y z occ Biso Ca .81278 .37024 .75039 .64 FeM(1,1) .89015 .05073 .00773 .97 .57 MgM(1,1) .89015 .05073 .00773 .03 .57 FeM(1,2) .89010 .05099 .49227 .96 .60 AlM(1,2) .89010 .05099 .49227 .04 .60 FeM2 .94082 .74010 .24982 .92 .61 MnM2 .94082 .74010 .24982 .08 .61 Si1 .95948 .36887 .24998 .42 Si2 .67939 .22717 .25025 .43 O1 .00995 .02989 .74868 .90 O(2,1) .93619 .27203 .01701 .62 O(2,2) .93611 .27192 .48285 .59 O3 .77741 .10968 .25054 .63 O(4,1) .67086 .32954 .01833 .64 O(4,2) .67082 .33004 .48163 .63 O5 .58484 .10091 .25027 .58 O6 .60174 .02566 .75030 .80 O7 .79840 .10925 .74904 .63 H .74451 .06193 .74989 2.42