Corundum
Pauling L, Hendricks S B
Journal of the American Chemical Society 47 (1925) 781-790
Crystal structures of hematite and corundum
Locality: Ceylon
_database_code_amcsd 0014077
5.120 5.120 5.120 55.28 55.28 55.28 R-3c
atom    x     y    z
Al   .355  .355 .355
O    .553 -.053  .25