C60 can refer to any substance composed of molecules with 60 carbon atoms. Buckminsterfullerene on the other hand is specifically the substance composed of soccer ball shape molecules with 60 carbon atoms arranged in a face centered cubic arrangement. According to my question How ductile is C60?, if buckminsterfullerene can keep being pulled thinner and thinner like gold, it might be a really good structural material. However, if it's not chemically stable, there is no use in using it even if it can keep being pulled thinner and thinner like gold. So my question is:
Has it been proven that buckminsterfullerene is stable?