In your opinion, how long do you think this process really takes?
On Sun, 28 Feb 1999 23:04:03 -0800 "RangerTP" <[EMAIL PROTECTED]>
writes:
> How does petrified wood form?
>
>------------------------------------------------------------
>----------
>
>Petrified wood is wood that has turned to stone. Often it
>shows beautiful colors that were not present in the original
>wood. How does wood turn to stone?
>
>When wood dies it begins decaying immediately. To become
>petrified it must be quickly covered by a layer of volcanic
>ash, mud, or other material that excludes oxygen, thus
>preventing it from decaying.
>
>If conditions are right, the organic part of the wood
>dissolves slowly, and at the same time minerals replace the
>organic matter, duplicating its structure exactly. The
>mineral replacement can be silica, calcite, pyrite, or
>marcasite.
>
>The colors are caused by impurities in the replacing
>mineral. The most common impurity is iron, which causes
>red, orange, or yellow colors. Manganese or copper can
>cause blue, black, or green colors.
>
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