Silicified woods are woods that have been changed into quartz by a replacement of the cellular structure of the wood by siliceous waters.
In some mountainous area, woods regularly fall into stream and river. The water containing Silica will then slowly replace the cellular structure inside the wood with silica, and this causes the wood to have the property of glass.
Pic: The wood reflects like a mirror. Amazing huh~~
This process takes millions of years and this one is being exhibited at FRIM (Forest Reseach Institute Malaysia) at Kepong.
Saw it and knew that piece of junk is certainly no ordinary junk. =P
Malcolm
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