58. Class 'm3m' belong to: A. Trigonal system B. Isometrie system C. Hexagonal system D. Triclinic system (BHU-2013)
I first time saw m3m class..? I didn't see in books .I read In klein and Nesse that point groups in isometric system are-- 23, 2/m bar3 , 432 , bar4 3m ,. 4/m bar3 2/m.