Diamond has the same cubic structure as silicon and germanium and because of the strength of the carbon-carbon bonds, it is the hardest naturally occurring substance in terms of resistance to scratching.. 
èdè Tsonga tàbí èdè KSITsonga (x]ìkógun) jẹ́ èdè ní orílẹ̀-èdè gúúsù Afrika.Àwọn ìtọ́kasí.. 