The ReO₃ structure consists of a simple cubic array of Re⁶⁺ ions with O^2- ions in the centre of each edge

All of the Re ⁶⁺ ions are 6-coordinate and the O^2- ions are 2-coordinate.

The unit cell (shown on the right) contains 8x(1/8) Re⁶⁺ ions and 12x(1/4) O^2- ions.