A simple chemical vapor deposition in a graphite crucible was employed in the development of two-dimensional nanomaterials of boron carbide. The sole starting material was B2O3 powder, and the deposition was undertaken on a chemically and thermally stable insulating template, graphitic boron nitride. The majority of the boron carbide products (B4C structure, R(3) over bar m) exhibit a beltlike morphology with lateral dimensions of 5-10 mum (in width) and 50-100 mum (in length), while the thickness is in the nanoscale range (20-100 nm). Transmission electron microscopy revealed a strong dependence of growth morphology on the number (n) of different {1,-1,-1} surfaces appearing during the crystal growth. The dimensionality of the boron carbide crystallites can be described by (3 - n); for example, the appearance of a sole (n = 1) {1,-1,-1} surface leads to a two-dimensional material while zero-dimensional particles, i.e., icosahedral quasicrystals, appear when n = 3. Growth morphology can possibly be controlled via controlling the temperature and the vapor pressure of the starting source.