Keep looking. Razors finishers are actually a dime a dozen as far as natural stones go. Lots of different stones are fine enough to finish a razor. Natural bevel setters worth a damn are the rarity.
Ah, but it looks like @jaro 101969 lives in 'South East USA'... which is also where @timwcic is I believe.
And I wouldn't fancy my chances of finding anything half-decent in the wild within about 1000km of Tim.