A novel cocrystal (NEX-1) of CL-20 and MDNT is presented herein. The CL-20:MDNT cocrystal, obtained in high yield by resonant acoustic mixing, shows new properties versus the discrete components. This is the first example of cocrystallization of CL-20 where the new material is less sensitive to friction than CL-20 itself, while demonstrating similar impact and ESD sensitivity. The CL-20:MDNT cocrystal shows promise in the production of new energetic materials of interest by the cocrystallization of well-characterized components.