[Jewelry making - Article 01336] - Re: [Orchid] Agatized dinosaur bones

[John Burgess]

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>     For those interested in Agatized dinosaur bone,there was an
>     interesting program on the Science Channel a week or so ago
>     regarding preserved _soft tissue. 

    G'day; I was a bit reluctant to join this, but I quote the above
    from an orchidist mailing, but the underline is mine. I ask 'since
    when is bone - any bone, been regarded as soft tissue?' 

    Bone is the hardest part of of any animal. When alive animal bone has
    cells filled with soft tissue, which soon rots away, leaving the bone
    porous and so able to absorb a fossilising mineral which will
    preserve it for millions of years. And agate is a silica based hard
    material left in and around the bone when the liquids have left.
    Thus, whilst the soft material in the bone is gone for ever, the
    silica based material has taken it's place and the place of any
    actual bone, which may also have gone. 

Cheers for now,
JohnB of NZ
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