Re: Re: Re: petrified wood/beautiful rocks
I bought some pieces very similar to this a few years ago in Tucson from a small dealer. She claimed it was opalized wood from Madagascar but there is no way to verify that. It is indeed very brittle, it is maddeningly difficult to grind into cabochon shapes. However, if all you plan to do is display it, you are in luck. Since it is all stone, there is nothing you need to do to preserve it, and it already has a a great appearance, so after washing it the only thing you need to do is not drop it. :-)
The process of how wood is changed to stone is still not completely understood, but you can probably find some good info on the Mindat or Amethyst Galleries sites, or just google it.
From Tim Casey - April 03, 2010 at 23:43:31