Crystolecule fragment
From apm
Here is a rather small structural diamondoid crystolecule with some bonds (brighter red) intentionally left open/dangling/unpassivated. A crystolecule fragment. Such surface interfaces can be fused together via seamless covalent welding in the second assembly level and perhaps higher assembly levels.
Crystolecuels with some surface interface featuring open covalent bonds or
open dative bonds like: Boron nitrogen dative bond interfaces
