Dravite Bosi F, Lucchesi S European Journal of Mineralogy 16 (2004) 335-344 Crystal chemistry of the schorl-dravite series Note: Tourmaline sample TM507c Locality: Olkhon (Lake Baikal), Siberia _database_code_amcsd 0007038 15.9610 15.9610 7.2214 90 90 120 R3m atom x y z occ NaX 0 0 .22653 .457 CaX 0 0 .22653 .246 KX 0 0 .22653 .012 MgY .12375 .061875 .63506 .486 AlY .12375 .061875 .63506 .254 V3+Y .12375 .061875 .63506 .238 Cr3+Y .12375 .061875 .63506 .014 Ti4+Y .12375 .061875 .63506 .008 AlZ .29797 .26169 .61137 .760 MgZ .29797 .26169 .61137 .182 Cr3+Z .29797 .26169 .61137 .043 V3+Z .29797 .26169 .61137 .015 SiT .19154 .18973 0 .992 AlT .19154 .18973 0 .008 B .10981 .21962 .45339 OH1W 0 0 .77136 .536 O1W 0 0 .77136 .383 F1W 0 0 .77136 .081 O2 .06071 .12142 .48327 OH3V .26281 .131405 .51100 O4 .09277 .18554 .07158 O5 .18295 .091475 .09182 O6 .19479 .18510 .77827 O7 .28476 .28435 .07872 O8 .20909 .26984 .44037