抄録
We observed fibrous alumino silicate in xenolith from Asama Volcano by transmission electron microscope (TEM), in order to identify their phase. In observation using scanning electron microscope (SEM), this mineral is similar to sillimanite, but slightly and significantly more Al-rich than stoichiometric sillimanite. As the result of TEM observation, mullite surrounded by sillimanite was found in sub-micrometric scale.
