Merrillite Hughes J M, Jolliff B L, Gunter M E American Mineralogist 91 (2006) 1547-1552 The atomic arrangement of merrillite from the Fra Mauro Formation, Apollo 14 lunar mission: The first structure of merrillite from the Moon _database_code_amcsd 0004238 10.2909 10.2909 36.8746 90 90 120 R3c atom x y z occ Uiso Na 0 0 .8137 .23 .07 Ca1 .2763 .1398 .67489 .0247 Ca2 .2745 .1376 .56760 .0195 Ca3 .3805 .1887 .76925 .0251 Mg 0 0 0 .80 .0144 Fe 0 0 0 .20 .0144 P1 0 0 .73247 .93 .0193 P2 .3151 .1390 .86556 .88 .011 P3 .3429 .1539 .96904 .89 .016 O1 0 0 .6905 .027 O2 -.0075 .1375 .7450 .032 O3 .2713 .0915 .8262 .031 O4 .247 .233 .8792 .029 O5 .2717 -.001 .8881 .021 O6 .4887 .245 .8694 .029 O7 .3776 .189 .0092 .028 O8 .3993 .0509 .9564 .028 O9 .4141 .3040 .9491 .026 O10 .1723 .084 .9622 .026