Silicon borides (also known as boron silicides) are lightweight ceramic compounds formed between silicon and boron. Several stoichiometric silicon boride compounds, SiB, have been reported: silicon triboride, SiB, silicon tetraboride, SiB, silicon hexaboride, SiB, as well as SiB ("n" = 14, 15, 40, etc.). The "n" = 3 and "n" = 6 phases were reported as being co-produced together as a mixture for the first time by Henri Moissan and Alfred Stock in 1900 by briefly heating silicon and boron in a clay vessel