Sadly, all my tests have indicated that solid-state materials can't do diddly. You need to make it either boil into a vapor or melt into a liquid before it can contaminate a person. When I was working with bolts, the stuff did absolutely nothing even after I'd turned the "test subjects" into pincushions and then taken direct control of them to prevent them pulling out the bolts.
Something just occurred to me though... It may be possible to infect creatures through the use of cave-ins.
Cave-ins in this version generate a large amount of dust, which is actually tracked and generated by the stone involved, instead of just the generic "dust" of previous versions. This means that walls, floors, and creatures can get a coating of dust.
If the stone happens to be a contact poison, it may be possible that the creature will start developing symptoms. I haven't tested this however, it's purely theoretical.
EDIT: FreakyCheeseMan, temperature-activated toxins can be a little tricky, seeing as temperatures in this version seem to be a little... Odd. I would set it at just under magma temperature, rather than just above room temp. Even underground, there are some weird temperature variations.
Also, I have no idea what temperature magma heats adjacent squares to... That would be your best bet, provided it isn't too close to the normal temperature range.