Opal, sprouting a petrified tree

[Кирилл Сызранский]

What a beauty:

23.5 carats of $ 2350.

[Konstantin]

Yes ...

And what of the physics of the process?

[Кирилл Сызранский]

Сообщение от Konstantin; 2841181 "

And what of the physics of the process ?

I read it, but did not understand.

Petrified wood is pseudomorphoses silica ( opal ) for wood . Silifikatsii exposed trunks , stumps , roots of trees sometimes . In this sohranayaetsya characteristic structure of a tree with annual rings , heart-shaped beams, structural details of the fiber that be important in diagnosis . Sometimes observed on the trunks of light weathering crust , a thin rim of silicified host rock , sand , gravel , sealed siliceous or carbonate cement . Petrified wood forms an increasingly opaque selection, in the best examples - translucent in thin breaks .