Opalized Petrified Wood?

[mikep691]

I've been told that this is opalized petrified wood. Your opinions? Value?



Other side:

 

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[kcm]

I don't know about "opalized" - actually, I need to look that term up. What makes the piece interesting (to me) is how the wood silicified with one side being nearly 100% of one growth ring. That's pretty cool!

 

[IAMZIM]

It looks agatized but not opalized. At least not opal with any fire in it.

 

[Eu_citzen]

I agree with IAMZIM, opal tends to have a glassy appearance. But, if you want to know for certain; a hardness test will settle that.
Quartz will scratch Opal, but not chalcedony which I believe this one to be made of.