aegirine-augite

mineral

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In aegirine
…a continuous chemical series with aegirine-augite, in which calcium replaces sodium, and magnesium and aluminum replace iron. In this series, the name acmite is given to crystals with the composition NaFeSi₂O₆ as well as to the reddish brown or greenish black pointed crystals approximating that composition. Aegirine generally is restricted…
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