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Quartz in Geode

Quartz and Silica Minerals Gallery

From Andrew Alden, About.com

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Quartz commonly forms a crust of crystals on the inside of geodes in addition to the layers of chalcedony (cryptocrystalline quartz) in this cut section.

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Two kinds of silicaPhoto (c) 2007 Andrew Alden, licensed to About.com

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