Dravite
Bosi F, Lucchesi S
European Journal of Mineralogy 16 (2004) 335-344
Crystal chemistry of the schorl-dravite series
Note: Tourmaline TMl4aa
Locality: Cruziero, Minas Gerais, Brazil
_database_code_amcsd 0007053
15.9664 15.9664 7.1758 90 90 120 R3m
atom       x       y      z  occ
NaX        0       0 .22844 .712
KX         0       0 .22844 .009
AlY   .12399 .061995 .63070 .379
Fe2+Y .12399 .061995 .63070 .365
MgY   .12399 .061995 .63070 .115
Fe3+Y .12399 .061995 .63070 .104
Ti4+Y .12399 .061995 .63070 .017
Mn2+Y .12399 .061995 .63070 .009
ZnY   .12399 .061995 .63070 .008
LiY   .12399 .061995 .63070 .004
AlZ   .29828  .26164 .61100 .876
MgZ   .29828  .26164 .61100 .089
Fe3+Z .29828  .26164 .61100 .035
SiT   .19182  .18989      0 .994
AlT   .19182  .18989      0 .006
B     .11022  .22044 .45478
O1W        0       0 .77812 .703
F1W        0       0 .77812 .157
OH1W       0       0 .77812 .140
O2    .06138  .12276 .48610
OH3V  .26658  .13329 .51046
O4    .09323  .18646 .06933
O5    .18610  .09305 .09110
O6    .19691  .18673 .77645
O7    .28504  .28535 .07914
O8    .20966  .27054 .44110