Devrae tries to find out more about this material. Specifically, who knows how to work with it and where they can be found. Failing that, where it is most commonly found might provide a clue of where to look for someone that can work in syenite.
The librarian explains that syenite is quite a new material which has not been fully documented, but the library would pay handsomely for such.
Devrae let's the librarian know that the material can be worked by a smith and that it was located it in some caves near the Stormhorns, not very far underground. That's all he knows so far.