Dravite Hamburger G E, Buerger M J American Mineralogist 33 (1948) 532-540 The structure of tourmaline Locality: de Kalb, New York, USA _database_code_amcsd 0000045 15.951 15.951 7.24 90 90 120 R3m atom x y z NaX 0 0 .770 MgY .133 .0665 .255 AlZ .050 .3670 .825 SiT .192 .1920 .624 B .117 .2340 0 OH1 0 0 .403 O2 .058 .1160 0 OH3 .233 .1165 .032 O4 .142 .0710 .624 O5 .102 .2040 .742 O6 .200 .2000 .403 O7 .279 .2460 .758 O8 .058 .2920 0