Unique, Polished Arizona Petrified Wood Slice with Fungus - 11.2"

This is a brilliantly colored, 11.2" wide round of Araucarioxylon arizonicum petrified wood from Northern Arizona. It has beautiful red, tan, orange and pink coloration. One side has been highly polished to a mirror like finish by one of the top petrified wood polishers around. There are no dull areas or scuff marks.

What truly makes this specimen unique is the association of a fungus that originally formed on the tree when it was still alive. The circular mass on one edge of this petrified wood is the fungus that fossilized. Since fungus doesn't fossilize quite like wood (silica replacement), it was replaced by barite instead, explaining why the fungus portion of the polish doesn't have as nice of a luster as the polished wood.

The vibrant coloration is due to the contaminating minerals in the silica which replaced the original wood structure. For example pinks and reds are due to hematite, a form of oxidized iron. This is similar petrified would which is found in the Petrified Forest National Park. The petrified forest encompasses nearly 100k acres and this wood comes from land outside of the park.

It is from the extinct conifer Araucarioxylon arizonicum which happens to be the state fossil of Arizona. The petrified wood of this tree is frequently referred to as "Rainbow wood" because of the large variety of colors some specimens exhibit. The red and yellow are produced by large particulate forms of iron oxide, the yellow being limonite and the red being hematite. The purple hue comes from extremely fine spherules of hematite distributed throughout the quartz matrix.

Araucarioxylon arizonicum is estimated to have grown more than 150 feet high and dominated the tropical forests in what is now Arizona nearly 225 million years ago.