Dravite
Bosi F, Lucchesi S
European Journal of Mineralogy 16 (2004) 335-344
Crystal chemistry of the schorl-dravite series
Note: Tourmaline TM507e
Locality: Olkhon (Lake Baikal), Siberia
_database_code_amcsd 0007039
15.9521 15.9521 7.2167 90 90 120 R3m
atom       x       y      z  occ
NaX        0       0 .22631 .479
CaX        0       0 .22631 .335
KX         0       0 .22631 .010
MgY   .12365 .061825 .63529 .527
AlY   .12365 .061825 .63529 .286
V3+Y  .12365 .061825 .63529 .152
Cr3+Y .12365 .061825 .63529 .021
Ti4+Y .12365 .061825 .63529 .013
Fe2+Y .12365 .061825 .63529 .001
AlZ   .29790  .26163 .61160 .787
MgZ   .29790  .26163 .61160 .189
Cr3+Z .29790  .26163 .61160 .016
V3+Z  .29790  .26163 .61160 .008
SiT    .1916  .18980      0 .992
AlT    .1916  .18980      0 .008
B     .10971  .21942 .45363
OH1W       0       0 .77109 .507
O1W        0       0 .77109 .439
F1W        0       0 .77109 .054
O2    .06051  .12102 .48275
OH3V  .26302  .13151 .51130
O4    .09276  .18552 .07190
O5    .18264  .09132 .09212
O6    .19470  .18511 .77832
O7    .28484  .28432 .07900
O8    .20901  .26981 .44055