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: Lago di Cignana, Western Alps, Italy
_database_code_amcsd 0004997
15.945 15.945 7.210 90 90 120 R3m
atom      x      y       z  occ   Uiso
NaX       0      0   .2325  .84  .0204
CaX       0      0   .2325  .09  .0204
KX        0      0   .2325  .01  .0204
MgY  .12426 .06213  .63250 .547 .00810
AlY  .12426 .06213  .63250 .263 .00810
FeY  .12426 .06213  .63250 .160 .00810
MnY  .12426 .06213  .63250 .020 .00810
TiY  .12426 .06213  .63250 .007 .00810
NiY  .12426 .06213  .63250 .007 .00810
ZnY  .12426 .06213  .63250 .003 .00810
AlZ  .29802 .26159  .61070 .833 .00545
MgZ  .29802 .26159  .61070 .167 .00545
SiT  .19175 .18990 -.00135 .997 .00520
AlT  .19175 .18990 -.00135 .003 .00520
B    .10987 .21974   .4536       .0065
OH1       0      0   .7712  .65  .0135
F1        0      0   .7712  .35  .0135
O2   .06106 .12212  .48347      .01023
O3   .26510 .13255  .50989       .0125
H3     .256   .128    .400        .045
O4   .09310  .1862  .06931      .01017
O5   .18433 .09217  .09025      .01010
O6   .19581 .18592  .77662      .00840
O7   .28489 .28483  .07811      .00850
O8   .20927 .27006  .44018      .00962