Variations on the Hexakisoctahedron

Some cubic forms as described by AEH Tutton: a hexakisoctahedron, an icositetrahedron, and a triakisoctahedron. Tutton believed that diamonds often formed hexakisoctahedra but were usually too rounded for confirmation. See "Crystallography and Practical Crystal Measurement", AEH Tutton, Macmillan and Co. Ltd, London, 1911, Chapter XI, p. 157. and also Figures 85, 87, 88. https://archive.org/details/crystallographyp00tuttuoft