Analysis of rotation and Weissenberg photographs of a single crystal of bornite from the Carn Brea Mine, Illogan, Cornwall, has led to the conclusicn that the crystal structure of bornite is not strictly isometric, but is pseudo-iscmetric, and is approximated by an arrangement in a cubic cell of edge-length 5.47 Å of four sulfur atcms at 000,12120,01212,12012, with four copper or iron atoms statistically distributed over the positions 141414,343414,143434,341434, and two copper or iron atoms statistically distributed over the positions 143414,341414,141434,343434, the total number of copper atoms in the cell being five and the total number of iron atoms being one on the average.

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