Cu 2 O (for the crystal structure, see Fig. 6.1) is one of the stable phases of the three well-established copper oxide compounds (the others are Cu 4 O 3 and CuO). It crystallizes in a simple cubic Bravais lattice (Cuprite-Mindat directory, 2010, Cuprite—Webmineral, 2010, Frondel, 1941, Wells, 1984).The space group is Pn3m or O …