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What is a Geode?

natural quartz geode

Geode | Rock Cavity with Visible Crystals

A geode is a rock cavity that contains quartz or chalcedony crystals or possibly both. 

The purple variety of quartz known as amethyst is one of the most popular geodes.  Although citrine is also well known, most citrine geodes are amethyst that has been heated.

The quartz geode in our photo is courtesy of Stan Celestian.  Clicking the photo redirects to the original non-compressed image. 

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