What is the secret to petrified wood?

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I've been 120 lumberjacking for some time now and chopped over 300k worth of logs and not a single piece of petrified wood. I read that wood is not static like ore so it shouldn't matter what tree I'm chopping. Only thing I can think of is that there is gear to take me past 120 making it possible to get it at 125 or something. Any inside knowledge would be appreciated.

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Nevermind, with the help of another player I learned that Ghost's posting about wood types not being static is incorrect and that I wasn't chopping the right trees. Wood types are in fact static.