Fluor-uvite Grice J D, Ercit T S Neues Jahrbuch fur Mineralogie, Abhandlungen 165 (1993) 245-266 Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Sample: Uvite 52210 Locality: Gouverneur, St. Lawrence Co., New York, USA _database_code_amcsd 0018793 15.973 15.973 7.213 90 90 120 R3m atom x y z occ Uiso CaX 0 0 .2291 .54 .0124 NaX 0 0 .2291 .42 .0124 MgY .12626 .06313 .6292 1.003 .0075 LiY .12626 .06313 .6292 .002 .0075 Fe3Y .12626 .06313 .6292 .0067 .0075 AlZ .29802 .26166 .6135 .91 .0056 MgZ .29802 .26166 .6135 .0833 .0056 TiZ .29802 .26166 .6135 .0083 .0056 SiT .19190 .19017 0 .9983 .0052 TiT .19190 .19017 0 .0017 .0052 B .1098 .2196 .4524 .0070 F1 0 0 .7743 .62 .0097 OH1 0 0 .7743 .33 .0097 O1 0 0 .7743 .05 .0097 O2 .06082 .12164 .4761 .0095 O3 .26772 .13386 .5118 .0105 O4 .09232 .18464 .0716 .0096 O5 .1820 .09100 .0914 .0099 O6 .19604 .18700 .7781 .0083 O7 .2850 .28433 .0812 .0086 O8 .2097 .2702 .4427 .0096 H3 .262 .131 .403 .0100