Akermanite Mokeeva V, Makarov E Geokhimiya 10 (1979) 1541-1544 Isomorph in melilites: refining of crystal structure of akermanite and intermediate melilite Locality: Capo di Bove, Italy _database_code_amcsd 0017812 7.738 7.738 5.045 90 90 90 P-42_1m atom x y z occ Biso Ca .3369 .1631 .5112 .98 1.27 Na .3369 .1631 .5112 .02 1.27 MgT1 0 0 0 .24 .86 AlT1 0 0 0 .04 .86 FeT1 0 0 0 .12 .86 SiT2 .1433 .3567 .9538 .65 .77 AlT2 .1433 .3567 .9538 .31 .77 O1 .5 0 .1798 1.33 O2 .1409 .3591 .2730 1.28 O3 .0851 .1748 .8017 1.38