It called expanded graphite , the bigger the flake the bigger the basal plane .
the better the conductivity . Amorphous graphite has no basal plane , it's a scrambled mess .
look at the photos on the left side ......and the flake size 500 micron
https://www.google.com.au/search?q=...ontent%2F160%2F8%2FH459.figures-only;1280;845
