Dani,
Wish I had first hand experience with bone but I don't. Super glue " gel" or super glue " thick" is designed for porous, while regular thin super glue works best with hard surfaces. I've used both when gluing up cracks in wood bowls. Usually the regular super glue most of the time. I suspect regular would work for bone, but can't say for certain. What I might suggest is a thin application to both surfaces, allow it to soak in and seal the porosity. Then a second application to glue the pieces together. You might also send a message to Mike P in Yukon, I'm sure he will know exactly what to use.