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Oursinite is a rare Co-bearing uranyl silicate of the uranophane group. The structure of oursinite, (Co 0.8 Mg 0.2 )[(UO 2 )(SiO 3 OH)] 2 (H 2 O) 6 , is orthorhombic, space group Cmca, a = 7.0494(5), b = 17.550(1), c = 12.734(1) Å, V = 1575.4(2) Å 3 , Z = 4. It was solved by direct methods and refined on the basis of F 2  for all unique reflections using least-squares techniques to an agreement index (R1) of 2.66%. The structure contains an approximately linear (UO 2 ) 2+  uranyl ion that is present as a uranyl pentagonal bipyramid, one symmetrically distinct SiO 3 OH acid silicate group, and one M 2+ (OH,H 2 O) 6  octahedron (M is dominated by Co). The uranyl pentagonal bipyramids and silicate tetrahedra are linked by the sharing of edges and vertices, giving a sheet based upon the uranophane anion topology. Adjacent sheets are linked by M 2+ (OH,H 2 O) 6  octahedra located in the interlayer, and by hydrogen bonds. Each M 2+ (OH,H 2 O) 6  octahedron contains two OH groups that are apical ligands of silicate tetrahedra in adjacent uranyl silicate sheets. Although several uranophane-group minerals contain sheets that are based upon the uranophane anion topology, the oursinite sheet involves novel orientations of silicate tetrahedra.

A novel arrangement of silicate tetrahedra in the uranyl silicate sheet of oursinite, (Co 0.8 Mg 0.2 )[(UO 2 )(SiO 3 OH)] 2 (H 2 O) 6