It seems to me you will find all the necessary for you information on p.145 and p.179 in Chapter 2 - Carbon (Graphene/Graphite) of Volume 1 of my book "Ultra-High Temperature Materials". You can download it from my ResearchGate account.
to Dr. A. Fomin: Mechanical mixture...?! This is the description of equilibrium phase diagram exactly (!), in this case a picture is not necessary. The key points described are much more important than the pictures, which sometimes are even useless. This my volume contains 800 pages, with the pictures it would be more than 2000 pages (!)...