Geodes (After)
(c) 2002 Andrew Alden, licensed to About.com, Inc. (fair use policy)
Okay, the geodes weren't full of treasure. The geode on the left had a few small cavities lined with milky silica. The wavy inner surface is bumpy rather than crystalline. The geode on the right was almost entirely a tough mixture of layered matrix, silica, and earthy material.
Oh well, I'll keep trying. Or just buy a nice specimen in a rock shop.
Fossils
Geologic Features and Processes
Glaciers and Ice
Landforms
Minerals
Rocks
Geology and Society
