Dear experts - I'm writing a novel in my spare time, and would appreciate some help with a little bit of research. Some of the story is set in the distant future, where super strong materials are available. My problem is that I don’t know how to describe these super materials. I want to describe the strongest possible atomic configuration of carbon, in a solid three-dimensional structure. Like diamond, but if possible stronger. Does this material already exist in theory? What colour and transparency is this material likely to have? Would it resemble metal? What would this material logically be called? If you can answer any of these queries, or even make a semi-educated guess, I'd be very grateful indeed. Thanks for your time.