[[Image:PetrifiedWood.jpg|right|thumb|Petrified log at the Petrified Forest National Park]] Petrified wood is a type of fossil, in which the tissues of a dead plant are replaced with minerals (most often a silicate, such as quartz). The petrifaction process occurs underground, when wood or woody materials suddenly become buried under sediment. Mineral-rich water flowing through the sediment deposits minerals in the plant's cells and as the plant's lignin and cellulose decays away, a rock (geology) cast is left in its place. Petrified wood can be extremely detailed, often reflecting the internal structures of the plant from which they form. Structures such as tree rings and vascular tissues such as xylem are often observed features. Petrified wood has a Mohs hardness scale of 7, the same as quartz. Materials scientists have been able to make artificial petrified wood recently.[http://www.usatoday.com/tech/science/discoveries/2005-01-25-petrified_x.htm?csp=15] A famous petrified wood site is Petrified Forest National Park in the U.S. state of Arizona. Wood from the area (though not from the park) is a prized commercial item, particularly cut and polished samples. ==See also== * Petrified palmwood * ''Araucarioxylon arizonicum'' ==External links== * [http://www.aegean.gr/Petrified_Forest/NoFrames/petriforest.htm The Petrified forest of Lesvos - Protected Natural Monument] Fossils Quartz varieties
==Images== I have this image, which offers a lot more detail. Adding or replacing? --User:Dschwen 01:56, 18 Nov 2004 (UTC) :I just added it at 300px just to see what it looked like with the earlier pic. What do you think? I'd say add it. Play with size maybe. -User:Vsmith 02:43, 18 Nov 2004 (UTC) :With two pics in the article I think I prefer the Wikipedia default thumbnail size. The fullsize pictures on the other hand should be as big as possible (in agreement with http://en.wikipedia.org/wiki/Wikipedia:Image_use_policy --User:Dschwen 02:54, 18 Nov 2004 (UTC) :Works for me. That is a great photo at full scale. The article could use a bit more info ... maybe some day. -User:Vsmith 03:16, 18 Nov 2004 (UTC)
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Petrified wood
[[Image:PetrifiedWood.jpg|right|thumb|Petrified log at the Petrified Forest National Park]] Petrified wood is a type of fossil, in which the tissues of a dead plant are replaced with minerals (most often a silicate, such as quartz). The petrifaction process occurs underground, when wood or woody materials suddenly become buried under sediment. Mineral-rich water flowing through the sediment deposits minerals in the plant's cells and as the plant's lignin and cellulose decays away, a rock (geology) cast is left in its place. Petrified wood can be extremely detailed, often reflecting the internal structures of the plant from which they form. Structures such as tree rings and vascular tissues such as xylem are often observed features. Petrified wood has a Mohs hardness scale of 7, the same as quartz. Materials scientists have been able to make artificial petrified wood recently.[http://www.usatoday.com/tech/science/discoveries/2005-01-25-petrified_x.htm?csp=15] A famous petrified wood site is Petrified Forest National Park in the U.S. state of Arizona. Wood from the area (though not from the park) is a prized commercial item, particularly cut and polished samples. ==See also== * Petrified palmwood * ''Araucarioxylon arizonicum'' ==External links== * [http://www.aegean.gr/Petrified_Forest/NoFrames/petriforest.htm The Petrified forest of Lesvos - Protected Natural Monument] Fossils Quartz varieties
Petrified wood
==Images== I have this image, which offers a lot more detail. Adding or replacing? --User:Dschwen 01:56, 18 Nov 2004 (UTC) :I just added it at 300px just to see what it looked like with the earlier pic. What do you think? I'd say add it. Play with size maybe. -User:Vsmith 02:43, 18 Nov 2004 (UTC) :With two pics in the article I think I prefer the Wikipedia default thumbnail size. The fullsize pictures on the other hand should be as big as possible (in agreement with http://en.wikipedia.org/wiki/Wikipedia:Image_use_policy --User:Dschwen 02:54, 18 Nov 2004 (UTC) :Works for me. That is a great photo at full scale. The article could use a bit more info ... maybe some day. -User:Vsmith 03:16, 18 Nov 2004 (UTC)
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Petrified_wood
Petrified_wood
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