Wednesday, June 01, 2005

Aegirine

A pyroxene mineral, sodium and iron silicate (NaFe+3Si2O6), that is commonly found in alkaline igneous rocks, particularly in syenites and syenite pegmatites. It also occurs in crystalline schists. Aegirine forms a continuous chemical series with aegirinaugite, in which calcium replaces sodium, and magnesium and aluminum replace iron. In this series, the name acmite

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