Dravite Bosi F, Lucchesi S European Journal of Mineralogy 16 (2004) 335-344 Crystal chemistry of the schorl-dravite series Note: Tourmaline TM9840c Locality: Lake Baikal, Siberia _database_code_amcsd 0007054 15.9341 15.9341 7.1890 90 90 120 R3m atom x y z occ NaX 0 0 .22767 .605 CaX 0 0 .22767 .151 KX 0 0 .22767 .010 MgY .12347 .061735 .63424 .418 AlY .12347 .061735 .63424 .407 Fe2+Y .12347 .061735 .63424 .112 Ti4+Y .12347 .061735 .63424 .043 V3+Y .12347 .061735 .63424 .008 ZnY .12347 .061735 .63424 .007 Mn2+Y .12347 .061735 .63424 .004 Cr3+Y .12347 .061735 .63424 .001 AlZ .29782 .26148 .61075 .843 MgZ .29782 .26148 .61075 .155 Fe2+Z .29782 .26148 .61075 .002 SiT .19174 .18985 0 .990 AlT .19174 .18985 0 .010 B .10983 .21966 .45398 OH1W 0 0 .77326 .510 O1W 0 0 .77326 .420 F1W 0 0 .77326 .070 O2 .06082 .12164 .48612 OH3V .26311 .131555 .51025 O4 .09327 .18654 .07121 O5 .18405 .092025 .09253 O6 .19517 .18510 .77699 O7 .28522 .28490 .07853 O8 .20931 .27006 .44004