The composition and stoichiometry of several skutterudite specimens were determined with a microprobe, as skutterudite is often zoned and intergrown with safflorite. Maximum concentration obtained was 82 percent CoAs 3 , 7 percent NiAs 3 , and 11 percent FeAs 3 ; cell dimensions averaged 8.21 A. The structural formula for two specimens was calculated and indicates total Co, Fe, and Ni in excess of the 8 required for the A position, and total As and S less than the 24 required for the B position. The grosser deficiency of As reported in previous analyses is probably due to safflorite intergrowths.

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