Amorphous carbon contains both sp2 and sp3 hybridized carbons atoms which form a short order range only. Therefore, one carbon atom is bonded to 3 as well as 4 other carbon atoms in amorphous allotrope of carbon.The ratio of sp2 and sp3 carbon atoms in amorphous allotrope depends on the method and type of conditions in which the allotrope has been made or exists in nature.