Manganocummingtonite Hawthorne F C, Grundy H D The Canadian Mineralogist 15 (1977) 309-320 The crystal structure and site-chemistry of a zincian tirodite by least-squares refinement of X-ray and mossbauer data _database_code_amcsd 0005138 9.606 18.126 5.317 90 102.63 90 C2/m atom x y z occ Biso SiT1 .2864 .08426 .2784 .978 .58 AlT1 .2864 .08426 .2784 .022 .58 SiT2 .2955 .16977 .7853 .99 .60 FeT2 .2955 .16977 .7853 .01 .60 MgM1 0 .08711 .5 .708 .70 ZnM1 0 .08711 .5 .252 .70 MnM1 0 .08711 .5 .039 .70 MgM2 0 .17744 0 .781 .72 FeM2 0 .17744 0 .185 .72 ZnM2 0 .17744 0 .034 .72 MgM3 0 0 0 .722 .73 ZnM3 0 0 0 .177 .73 MnM3 0 0 0 .101 .73 MnM4 0 .26251 .5 .710 .92 CaM4 0 .26251 .5 .140 .92 NaM4 0 .26251 .5 .105 .92 FeM4 0 .26251 .5 .045 .92 O1 .1138 .0864 .2116 .64 O2 .1224 .1723 .7198 .74 OH3 .1130 0 .7104 .72 O4 .3751 .2469 .7767 .98 O5 .3501 .1307 .0673 1.00 O6 .3492 .1204 .5616 1.09 O7 .3439 0 .2787 1.11