Abstract
Lattice constants for minerals corresponding to NiS2 and CoS2 in the pyrite group are compared with that of pyrite. A cobalt sulphide from the Shinkolobwe mine in the Belgian Congo gives a0= 5.52346 ± .00048 Å. A high nickel specimen from the Kasompi mine in the Belgian Congo gives a0=5.66787 ± .00008 Å. Pyrite from Leadville, Colorado, is found to yield the value a0=5.40667 ± .00007 Å.
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