Diamond is considered to be the hardest material, and it is well known that graphite transforms into diamond under conditions of high temperature and high pressure. One study succeeded in the synthesis of a super-hard material by compressing single-walled nanotubes (SWNTs) to above 24 GPa at room temperature. The hardness of this material was measured with a nanoindenter as 62–152 GPa. The hardness of reference diamond and boron nitride samples was 150 and 62 GPa, respectively. The bulk modulus of compressed SWNTs was 462–546 GPa, surpassing the value of 420 GPa for diamond. http://en.wikipedia.org/wiki/Carbon_nanotube "pjezo" <kaminskiukas_trinti_@delfi.lt> wrote in message news:hohmgr$uoi$1@trimpas.omnitel.net... > bijau sumeluoti, bet lyg ir jau yra rasta medziaga kietesne uz deimanta...