[Jewelry making - Article 00122] - Re: [Orchid] Agatized dinosaur bones

[Richard Davies]

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>     Agates form as a result of hydrothermal processes in igneous
>     rocks, and only found in the shapes called Amygdales ( geodes ). 

    Not only amygdules; a few years ago I found an agate with concentric
    carnelian banding that had formed within a cavity in a chunk of
    milky white vein quartz. The agate is nothing much, but the unusual
    occurrence is! I have not read of any other banded agate found here
    in Virginia. I assume that hydrothermal processes transported the
    silica and coloring minerals to the fracture zone while the vein was
    still far underground. (Milky vein quartz is locally abundant locally
    within the ancient phyllites that constitute the bedrock in my
    neighborhood.) 

Richard Davies
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