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I don't believe this is a geode, or a nodule. The variety I've had the most experience with are a variety made from calcite, sourced from layers of limestone. These usually have a telltale uneven surface texture to suggest they were formed by filling in a void (or a vug) in the rock layer. Your stone is very smooth, but I think it's very very pretty. [:
Another test I've used in the past is: pick it up and shake it, is there anything moving inside?
Or
Does it seem to weigh less than it should for its size? This will indicate a void, thus a geode.
I wish you the best of luck!
-V
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