Assertion: rhombohedral boron | /r/HasProperty | b 13 c
Facets:
Source sentences:
text: Icosahedral B 12 compounds include α-rhombohedral boron (B 13 C 2 ), β-rhombohedral boron (MeB x , 23≤x), α-tetragonal boron (B 48 B 2 C 2 ), β-tetragonal boron (β-AlB 12 ), AlB 10 or AlC