Dravite Bosi F, Lucchesi S European Journal of Mineralogy 16 (2004) 335-344 Crystal chemistry of the schorl-dravite series Note: Tourmaline TM112a Locality: Haddam, Connecticut, U.S.A. _database_code_amcsd 0007042 15.9633 15.9633 7.1942 90 90 120 R3m atom x y z occ NaX 0 0 .22916 .558 CaX 0 0 .22916 .257 KX 0 0 .22916 .002 MgY .12444 .06222 .63271 .433 AlY .12444 .06222 .63271 .292 Fe2+Y .12444 .06222 .63271 .150 Fe3+Y .12444 .06222 .63271 .094 Ti4+Y .12444 .06222 .63271 .018 ZnY .12444 .06222 .63271 .003 V3+Y .12444 .06222 .63271 .003 Cr3+Y .12444 .06222 .63271 .003 Mn2+Y .12444 .06222 .63271 .001 AlZ .29813 .26169 .61180 .863 MgZ .29813 .26169 .61180 .119 Fe3+Z .29813 .26169 .61180 .017 SiT .19192 .19005 0 .976 AlT .19192 .19005 0 .024 B .10987 .21974 .45418 OH1W 0 0 .77627 .470 O1W 0 0 .77627 .404 F1W 0 0 .77627 .126 O2 .06094 .12188 .48253 OH3V .26636 .13318 .51132 O4 .09273 .18546 .07058 O5 .18376 .09188 .09213 O6 .19629 .18643 .77720 O7 .28517 .28494 .08007 O8 .20950 .27022 .44133