Some samples of bornite recently obtained from an auriferous copper prospect near Usk, B. C., exhibit an unusually perfect cleavage. Generally this mineral presents only traces of octahedral cleavage, but in the specimens referred to the cleavage was almost as perfect as that of fluorite, with surfaces up to two centimeters in diameter. Some fragments which were measured on the goniometer gave angles well in accord with the theory for octahedral cleavage.

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