Great South Gems & Minerals

• Geode, Whole, Crack your own •
(Mexico)

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• Geode, Whole, Crack your own •
(Mexico)

geode - rounded nodule

Crack your own geodes. These geodes are running about 95% hollow. Here is a photo of three that I broke with my old trusty plumbing pipe cutter. See Ray's article on breaking geodes open.

The Audubon Society Field Guide to North American Rocks and Minerals describes a "geode" as a rounded nodule, lined with crystals, usually quartz or calcite. I have always thought of a geode as being a rounded rock with a cavity in the center. If the stone does not have a cavity in the center it is referred to as a nodule. If it is hollow, it's a geode.

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On a few occasions I have broken a geode open and found that the inside cavity was filled with water. Of course I didn't know that at the time and had no way of knowing that it had water in it. One of the guys here asked "How old is that water?" I I told them "As old as the rock!"

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