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