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SiC2 crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. Si4+ is bonded to four equivalent C2- atoms to form corner-sharing SiC4 tetrahedra. All Si–C bond lengths are 1.90 Å. C2- is bonded in a trigonal planar geometry to two equivalent Si4+ and one C2- atom. The C–C bond length is 1.37 Å.
SiC2 crystallizes in the cubic Pa-3 space group. The structure is three-dimensional. Si4+ is bonded to six equivalent C2- atoms to form SiC6 octahedra that share corners with twelve equivalent SiC6 octahedra and corners with six equivalent CSi3C tetrahedra. The corner-sharing octahedral tilt angles are 71°. All Si–C bond lengths are 2.08 Å. C2- is bonded to three equivalent Si4+ and one C2- atom to form CSi3C tetrahedra that share corners with three equivalent SiC6 octahedra and corners with fifteen equivalent CSi3C tetrahedra. The corner-sharing octahedral tilt angles are 70°. The C–C bond length is 1.36 Å.