Dravite Bosi F, Lucchesi S European Journal of Mineralogy 16 (2004) 335-344 Crystal chemistry of the schorl-dravite series Note: Tourmaline TM9840f Locality: Lake Baikal, Siberia _database_code_amcsd 0007055 15.9303 15.9303 7.1951 90 90 120 R3m atom x y z occ NaX 0 0 .22666 .594 CaX 0 0 .22666 .187 KX 0 0 .22666 .013 AlY .12321 .061605 .63495 .417 MgY .12321 .061605 .63495 .408 Fe2+Y .12321 .061605 .63495 .114 Ti4+Y .12321 .061605 .63495 .048 V3+Y .12321 .061605 .63495 .005 Mn2+Y .12321 .061605 .63495 .004 ZnY .12321 .061605 .63495 .002 Cr3+Y .12321 .061605 .63495 .002 AlZ .29780 .26144 .61059 .832 MgZ .29780 .26144 .61059 .165 V3+Z .29780 .26144 .61059 .004 SiT .19170 .18983 0 .992 AlT .19170 .18983 0 .008 B .10982 .21964 .45361 O1W 0 0 .77225 .504 OH1W 0 0 .77225 .442 F1W 0 0 .77225 .054 O2 .06073 .12146 .48591 OH3V .26260 .13130 .51039 O4 .09314 .18628 .07129 O5 .18396 .09198 .09306 O6 .19489 .18477 .77720 O7 .28522 .28486 .07817 O8 .20929 .27004 .43956