I would like to identify this chunk of rock i found

I found this at a friends house on his rock wall and haven't been able to figure out what it is or if its worth anything, or if i should try to split it. I dont know much lol Any help will be much appreciated, Found in Maine if that helps and i'd say it weighs about 25 lbs. I have it on another forum and a couple people suggested arizona petrified wood. which looks to be possible, I would like to hear some more feedback tho. maybe i'll have to get better pics in the daylight. but this pic does show colors well.

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Looks like some sort of chert to me. But indeed could be petrified wood, although the structure is not that well defined (or visible on the foto's).

Chert is flacky and was used to make spears. Does the rock chip easily and do the flackes have a radial patern on the cleavage side?

It does look like chert, specifically, because of the color banding, petrified wood. If it is chert, it should scratch glass as well as the side of a knife blade, and if you look at it under magnification, you should not be able to see distinct crystals. My bet is petrified wood.