Thar's Copper in Them Thar...Trees?

So, we've been splitting a ton of red oak the last few days, and this one old tree was probably 150+ years, and starting to decay from the inside out. What's this have to do with copper, you say? Check out the green streaks.
I did a little googling and there is some opinion that red oak (and possibly other species) can show signs of long term mineral absorption. They had a scientific name for it but I already forgot it.
Oh, and this guy...he lived his long life along the banks of a stream here called...hmmm, what was it again? oh yeah - Coppermine Brook.
What say you...verdigris or plain old fungus?

I did a little googling and there is some opinion that red oak (and possibly other species) can show signs of long term mineral absorption. They had a scientific name for it but I already forgot it.
Oh, and this guy...he lived his long life along the banks of a stream here called...hmmm, what was it again? oh yeah - Coppermine Brook.

What say you...verdigris or plain old fungus?
