In another paper (this issue, page 562) we have described a high hafnium zircon from Norway associated with the rare scandium mineral thortveitite. Also, we have confirmed qualitatively that hafnium and zirconium are present within the thortveitite structure. Since submitting the results of our study on the unusual zircon we have had the opportunity to quantitatively analyze three thortveitite specimens for their hafnium, zirconium and yttrium contents. Two specimens were from Norway and one was from Madagascar. The specimen from Madagascar was kindly loaned to us by the U. S. National Museum.

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