It appears there's actually four different varieties, but grxxf will specialize in the flake variety.
"One has to assume that $16.2B is thus the value of amorphous, flake, vein and synthetic markets together. The li-ion batteries, however, use a feedstock of a combination of natural flake graphite and/or synthetic graphite. As amorphous and vein graphite demand are not expected to grow, one can assume that natural flake and synthetic graphite demands will grow in a higher pace. In the case of natural graphite, the flakes need to be further purified, and both natural and synthetic need to be processed (shaping and coating) to produce anode material"
My posts are my opinion, do your own DD, the stock market is risky, don't spit into the wind, keep hands and feet inside the ride.. etc. etc.