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Eudialyte

The Silicate Minerals

From Andrew Alden, About.com

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Eudialyte is a ring silicate with the formula Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)22. It's usually brick-red and is found in the rock nepheline syenite.

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Hydrous alkali metal silicatePhoto courtesy Piotr Menducki via Wikimedia Commons

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