Schorl Bosi F, Lucchesi S European Journal of Mineralogy 16 (2004) 335-344 Crystal chemistry of the schorl-dravite series Note: Tourmaline TM9914b Locality: Lake Baikal, Siberia _database_code_amcsd 0007056 15.9821 15.9821 7.2215 90 90 120 R3m atom x y z occ NaX 0 0 .23234 .731 CaX 0 0 .23234 .163 KX 0 0 .23234 .005 Fe2+Y .12401 .062005 .63406 .286 AlY .12401 .062005 .63406 .277 MgY .12401 .062005 .63406 .240 Fe3+Y .12401 .062005 .63406 .146 Ti4+Y .12401 .062005 .63406 .030 V3+Y .12401 .062005 .63406 .015 ZnY .12401 .062005 .63406 .003 Cr3+Y .12401 .062005 .63406 .001 Mn2+Y .12401 .062005 .63406 .001 AlZ .29844 .26187 .61212 .814 MgZ .29844 .26187 .61212 .168 Fe3+Z .29844 .26187 .61212 .018 SiT .19178 .18992 0 .985 AlT .19178 .18992 0 .015 B .11016 .22032 .45471 OH1W 0 0 .77623 .509 O1W 0 0 .77623 .449 F1W 0 0 .77623 .042 O2 .06099 .12198 .48286 OH3V .26648 .13324 .51198 O4 .09266 .18532 .06979 O5 .18376 .09188 .09075 O6 .19641 .18664 .77815 O7 .28456 .28446 .08000 O8 .20933 .27003 .44199