Discovering Petrified Wood

At the end of my last blog post, I asked you what the picture below showed:

Wood...with a "metallic, rocky texture"

And the answer is...petrified wood!

Blocks of it were scattered around the bonsai park of the Hwa Dam Forest Arboretum in Gwangju. When I first touched one, I couldn't believe it was a type of "wood" because it felt just like the veneer of polished marble. The entire shape was of an ordinary log, but there was nothing less than extraordinary about it. It  Below are some pictures:

Looks like silvery paint brushed over an oily surface

There were even massive sculptures made of this material along with a notice board that explained briefly how this came to be:

Can you see two sculptures lurking in the background?

The sign talks of "the tree that became a stone" and as much as this sounds like something out of a fairy tale or a fantasy novel, the formation of this magnificent matter can be explained quite scientifically. 

Petrified wood, also known as silicified wood, is a type of fossil...or more accurately, "fossilized remains of terrestrial vegetation". It is formed when a tree's organic materials get replaced with minerals such as silica, calcite, pyrite and quartz. This occurs when the wood becomes buried in sediment through which dissolved solids flow through. The plant's lignin and cellulose decay, making room for stone mold to set. It is essential that there is protection from oxygen and various organisms to prevent aerobic decomposition. Petrified wood is an incredibly unique fossil: its original outline and shape are preserved without getting compressed or impressed like other types do. In fact, it would be quite accurate to say that it represents an three-dimensional record of the initial form. 

Enjoy more pictures! :)