A 100 Million Year Old Tree Fossil With Opal Growth Rings.

How gorgeous is this piece of opalized tree? It's almost otherworldly! According to the folks over at ZME Science, this is actually a pretty rare sample. While opal is fairly common inside petrified wood, this particular sample is fire opal and far more rare (and valuable). Basically, fire opals are the ones with all the magical looking colors.
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