Data are given on a composition, unit-cell parameters, refractive indices, and specific gravity for arfvedsonite and aegirine-augite from Seal Lake. The distribution of major cations between the two minerals is consistent with the theory that increasing polymerization of Si-O tetrahedra favors the incorporation of connecting ions with lower electronegativities.

First Page Preview

First page PDF preview
You do not currently have access to this article.