X-ray data from a single crystal of Bristol, Connecticut, bornite shows that bornite is a pseudocubic orthorhombic crystal with the following cell dimensions.

a = 21.94 Å

b = 21.94 Å

c = 10.97 Å

X-ray, thermal, and electrical evidences indicate that bornite can exist in both a low-and a high-temperature form, and that the structural difference between the forms is one of order-disorder. When thermally induced, the disorder first reaches a measurable magnitude at 170° C. and the critical temperature of complete disorder is reached at 220° C. By quenching in cold water the high or disordered form can be retained, but if cooled slowly from the elevated temperature the low form is regained.

The high-temperature form is cubic with a cell edge of 10.97 Å and belongs to one of the space groups: F43m, F43, Fm3m.

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