Dravite
Ertl A, Marschall H, Geister G, Henry D, Schertl H P,
Ntaflos T, Luvizotto G, Nasdala L, Tillmanns E
American Mineralogist 95 (2010) 1-10
Metamorphic ultrahigh-pressure tourmaline: structure,
chemistry, and correlations to P-T conditions
Locality: Parigi, Dora Maira, Western Alps, Italy
_database_code_amcsd 0004996
15.935 15.935 7.201 90 90 120 R3m
atom      x      y       z  occ   Uiso
NaX       0      0   .2396  .90  .0214
CaX       0      0   .2396  .05  .0214
KX        0      0   .2396  .01  .0214
MgY  .12571 .06286  .63044 .593  .0081
AlY  .12571 .06286  .63044 .330  .0081
FeY  .12571 .06286  .63044 .040  .0081
TiY  .12571 .06286  .63044 .010  .0081
AlZ  .29806 .26164  .61163  .85 .00622
MgZ  .29806 .26164  .61163  .15 .00622
SiT  .19191 .19000 -.00089      .00548
B    .10979 .21958   .4546       .0069
OH1       0      0   .7720  .72  .0144
F1        0      0   .7720  .28  .0144
O2   .06094 .12188   .4848       .0111
O3   .26529 .13265   .5106       .0127
H3     .259   .130    .400        .049
O4   .09305  .1861   .0694       .0107
O5   .18401   .092   .0909       .0106
O6   .19604 .18586  .77669      .00877
O7   .28501 .28490  .07900      .00867
O8   .20952 .27018  .44103      .00961