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GEODES<br />
Geological rock formation<br />
A geode is a sphere shaped rock which contains a hollow cavity lined with crystals.  The silica precipitation can contain any variety of dissolved minerals, the most common being quartz, but amethyst and calcite are also found.

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GEODES
Geological rock formation
A geode is a sphere shaped rock which contains a hollow cavity lined with crystals. The silica precipitation can contain any variety of dissolved minerals, the most common being quartz, but amethyst and calcite are also found.

Copyright:© 1987 Paul Silverman - Fundamental Photographs

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Paul Silverman