硅化了

The organic matter has turned into different types of agate-like minerals, such as jasper, crystal and amethyst. The color and quality varies based on many factors, in particular the metal impurity. In the old days, some people used dynamite to blow up the petrified wood to extract the semi precious stone.

所有跟帖： 

• 老猪还挺专业的 :),谢谢。 -DeepCreek- ♂ (0 bytes) () 10/13/2006 postreply 14:07:04

• 谢谢两位.补充两张近镜头 -erdong- ♀ (214 bytes) () 10/13/2006 postreply 14:09:54

• 对，就是这样。 -DeepCreek- ♂ (0 bytes) () 10/13/2006 postreply 14:11:29

• 好照片.顶一下. -猪先知- ♂ (578 bytes) () 10/13/2006 postreply 14:38:36

• 谢猪前辈指点 -erdong- ♀ (279 bytes) () 10/13/2006 postreply 16:46:44

• 回复：谢猪前辈指点 -猪先知- ♂ (196 bytes) () 10/14/2006 postreply 10:05:57