Assertion: b icosahedron | /r/CapableOf | form rhombohedral lattice unit
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Source sentences:
text: There, B 12 icosahedra form a rhombohedral lattice unit (space group: R3m (No. 166), lattice constants: a = 0.56 nm and c = 1.212 nm) surrounding a C-B-C chain that resides at the center of the lattice unit, and both C atoms bridge the neighboring three icosahedra.