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Home Other GeoPicture

GeoPicture of the week: Tree fossil with opal growth rings

Mihai Andrei by Mihai Andrei
November 12, 2013
in GeoPicture
Reading Time: 1 min read
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This is a part of an opalized tree, and the rings you see are actually tree rings; or at least they were.

opal tree

This is an very rare sample: opal can be fairly common in petrified wood, but this is a fire opal, which makes it so much more valuable. Fire opals are transparent to translucent opals with warm body colors of yellow, orange, orange-yellow or red – basically, it often has pretty colors.

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So how did this magnificent opalized tree came to be? Initially, water filled the cracks and empty spaces of the source fossil, and the silica content in the water hardened and turned into opal or chalcedony.

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Mihai Andrei

Mihai Andrei

Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.

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