I'd have to guess no on that one. Graphite is an allotrope of Carbon, so it's crystal structure is different to pure carbon, just like diamond which is another allotrope of cabon and which has a very high resistivity.
You'd have to do a search for graphite resistance and I think you should check a typo on your units mOhm, not Ohmm
ahh, doh! but resisitivity is a function of the resistance, and hence, I would still assume that different allotropes of carbon have different resistances and resistivities.