Dravite Bosi F, Lucchesi S European Journal of Mineralogy 16 (2004) 335-344 Crystal chemistry of the schorl-dravite series Note: Tourmaline TM235a Locality: Beresov Mine, Siberia _database_code_amcsd 0007040 15.9433 15.9433 7.2095 90 90 120 R3m atom x y z occ NaX 0 0 .23599 .751 CaX 0 0 .23599 .077 KX 0 0 .23599 .004 AlY .12464 .06232 .63334 .410 MgY .12464 .06232 .63334 .393 Fe2+Y .12464 .06232 .63334 .163 Ti4+Y .12464 .06232 .63334 .028 ZnY .12464 .06232 .63334 .003 V3+Y .12464 .06232 .63334 .001 Mn2+Y .12464 .06232 .63334 .001 Fe3+Y .12464 .06232 .63334 .001 AlZ .29814 .26164 .61171 .831 MgZ .29814 .26164 .61171 .151 Fe3+Z .29814 .26164 .61171 .012 Fe2+Z .29814 .26164 .61171 .006 SiT .19180 .18989 0 .998 AlT .19180 .18989 0 .002 B .10984 .21968 .45545 OH1W 0 0 .77311 .632 O1W 0 0 .77311 .364 F1W 0 0 .77311 .004 O2 .06087 .12174 .48727 OH3V .26410 .13205 .51171 O4 .09295 .18590 .07048 O5 .18410 .09205 .09170 O6 .19557 .18533 .77795 O7 .28494 .28481 .07922 O8 .20919 .26992 .44110