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Neptunite

The Pyroxene Minerals

By Andrew Alden, About.com Guide

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Neptunite is a very rare pyroxenoid with the formula KNa2Li(Fe2+,Mn2+,Mg)2Ti2Si8O24, shown here with blue benitoite on natrolite.

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Collectible alkali-lithium-titanium pyroxenePhoto (c) 2009 Andrew Alden, licensed to About.com

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