by a quarter of the body diagonal. The space group is Pnm, which includes the point group with full octahedral symmetry.

Preparation

Copper(I) oxide may be produced by several methods. Most straightforwardly, it arises via the oxidation of copper metal:
: Additives such as water and acids affect the rate as well as the further oxidation to copper(II) oxides. It is also produced commercially by reduction of copper(II)

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