The Compilation is making things Complicated, so I thought this might be useful. Just to try and keep everything as consistent as possible? :x
In the Japanese version of FFVII, they used the ‘Fire, Fira, Firaga’ system. In the English version, they used ‘Fire1, Fire2, Fire3’. Which do we want to go with? Furthermore, Crisis Core introduces more information about materia: not only do we have 5 main classifications of materia (each with their own colour), but now sub-classifications, and their colorations are slight variations of the main. To top it all off, we also have a few additional materia…
As for how big materia is, I think the usual interpretation is that they come in slightly different sizes? Most are about as big as a marble, but they can be larger, etc. According to the FFVII wiki, that's canon? IDK, maybe I'm just slow.
So, what do we do about this? (Yuffie is canon compliant, but I don’t want to steam-roller anybody and everybody.) If you want any more info, feel free to ask. If want to
add more info, or anything of the sort, please feel free to add it!
(Note: Mostly asking in case this ever comes up in IC conversation, or if any of the FFVII people ever get SC.)