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What is a geode?

A geode is a spherical, hollow, stonelike object. The inside of a geode is lined with small crystals that project inward. Geodes are frequently found in limestone beds in many parts of the world. They average 2 to 6 inches (5 to 15 centimeters) in diameter.

Sources: American Geological Institute. Dictionary of Geological Terms, Rev. ed, p. 181; The McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed., p. 843.

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