Assuming it has not been kept excessiviely damp and warm, flecks of white scattered in this black flake are not uncommon. I see it in SG flakes, too. Not sure anyone has ever said exactly what it is, but mold - probably not unless it is 3D and hairy like a dog. If you are afraid to smoke it send it to me, Mister Moo, for careful eyeballographic analysis and environmentally safe incineration disposal.
Stonehaven with white flecks:
