Orthopyroxene crystals from lunar norite 78236 and Civet Cat clast 72255 were compared with those of two diogenites, Johnstown and Ibbenb¿ren. Their exsolution and deformation textures were studied by analytical transmission electron microscope (ATEM) in addition to single crystal X ray diffraction and electron microprobe techniques. 72255 pyroxenes contain clinobronzite lamellae similar to those in Johnstown, which were interpreted to have formed by stress-induced transformation by shock events. The X ray and TEM observation of the orthopyroxene (En76Fs21Wo3) in 78236 shows no augite exsolution with (100) in common. Abundant Guinier-Preston zones, with several unit-cells wide, are present. The textures in conjunction with the thermal history proposed by chronologic data suggest that 78236 experienced slow cooling deep in the crust above 1000 ¿C, cooled rapidly due to excavation by an impact event, and then cooled slowly again at moderate temperature. This history is similar to that proposed for Johnstown. Computer simulation on the development of the (100) augite lamellae in 72255 and Ibbenb¿ren suggests a deep origin in the crust.