List of Rocks, Minerals, and Gemstones Found in Kansas
Opal is comprised of a dense formation of amorphous silica with some water. The silica is arranged in microscopic spheres, creating a stone that entirely lacks crystal formation but isn't quite a glass. Actual silica glass with a natural origin is generally obsidian. Opal: Ultimate Guide To Collecting Opal; Common opal is still an awesome ...
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