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Re: “How Did Our Agates Form?

Dear Professor Garlick, I enjoy your entries (and enjoyed your classes at HSU!). I should note, however, that it is incorrect to say that lavas "invariably contains a few percent dissolved water", especially the ones of rhyolite variety. If they did, it would be unlikely that they would erupt as lava (rather as tephra). Correct is a few tenths of a weight percent at the highest (we've measured many of these things). Sincerely,

Professor Jonathan Castro

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Posted by castroj69 on 07/14/2017 at 5:57 AM

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