AM_Oursinite Formula: (Co.8 Mg.2) U2 Si2 O18 H14 Name: Oursinite Unit cell: 7.0494 17.55 12.734 90.0 90.0 90.0 , V=1575.41 Space group: CMCA (64)

Kabatko K A , Burns P C , American Mineralogist , 91 (2006) p.333-336, A novel arrangement of silicate tetrahedra in the uranyl silicate sheet of, oursinite, (Co0.8Mg0.2)[(UO2)(SiO3OH)]2(H2O)6