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 0017811 7.760 7.760 5.029 90 90 90 P-42_1m atom x y z occ Biso Ca .3358 .1642 .5091 .75 1.2 Na .3358 .1642 .5091 .25 1.2 MgT1 0 0 0 .39 .68 AlT1 0 0 0 .41 .68 FeT1 0 0 0 .16 .68 SiT2 .1406 .3594 .9416 .62 O1 .5 0 .1775 1.25 O2 .1414 .3586 .2604 1.37 O3 .0833 .1833 .7985 1.42