We propose the molecules B12N12, B24N24 and B60N60 (named us as fulborenes) in the capacity of boron nitride analogues of the fullerenes. Ten possible crystals built from these molecules (named us as fulborenites) are predicted, including `superdense diamond', and their lattice parameters and densities are calculated. Comparison with explosive experiments allow us to identify the simple cubic fulborenite B12N12 with intermediate phase of BN. Multiwalled BN-nanotubes are produced by carbothermal synthesis, and their structure are studied by TEM, x-ray spectral microanalysis and molecular dynamic techniques.
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