And what is the best graphite to make graphene or carbon nanotubes, which are basically rolled up graphene?

http://patentscope.wipo.int/search/en/detail.jsf?docId=US76817973&recNum=1&maxRec=27&office=&prevFilter=&sortOption=Pub+Date+Desc&queryString=FP%3A%28vein+graphite%29&tab=PCTDescription

Well according to this patent application it is crystalline or vein/hydrothermal graphite.