Geikielite Liferovich R P, Mitchell R H Physics and Chemistry of Minerals 32 (2005) 442-449 Rhombohedral ilmenite group nickel titanates with Zn, Mg, and Mn: synthesis and crystal structures _database_code_amcsd 0008980 5.0544 5.0544 13.8737 90 90 120 R-3 atom x y z occ Biso NiA 0 0 .3555 1/3 .57 ZnA 0 0 .3555 1/3 .57 MgA 0 0 .3555 1/3 .57 TiB 0 0 .1452 .36 O1 .3188 .0197 .2442 .20