Any shapes with icosahedral or octahedral symmetry will also contain tetrahedral symmetry. NaZn(OH) consists of tetrahedral zincate ion and octahedral sodium cations. The adducts are usually either octahedral or tetrahedral. The tetrahedral spaces are smaller than the octahedral spaces. These ratios refer to the proportion of tetrahedral sheets to octahedral sheets. When the coordination number is neither octahedral nor tetrahedral, the splitting becomes correspondingly more complex. It may also occur as cubic, octahedral, or dodecahedral crystals. The "rhombic dodecahedron" is a zonohedron with twelve rhombic faces and octahedral symmetry. For both octahedral and icosahedral symmetry there are six forms. Cations in Y (M1) site are closely bound to 6 oxygens in octahedral coordination. It has cubical or octahedral symmetry. These are diamagnetic solids featuring octahedral Rh(III) centres. Fluorite has four perfect cleavage planes that help produce octahedral fragments. For instance, the group O of chiral octahedral symmetry has 24 elements. It is the simplest hydrocarbon with octahedral symmetry.