2.8" Rare Petrified "Snakewood" (Mennegoxylon) Slice - Texas
This is a gorgeous, 2.8" wide slice of petrified snakewood (Mennegoxylon jonesii) from the Eocene age Yegua Formation of Brazos County, Texas. This slice is polished to a glossy finish one side and displays wonderful preservation of the snakeskin-like wood grain detail.
Petrified wood is the name given to wood that has been turned into stone (fossilized) through the process of permineralization. All of the organic matter becomes replaced by minerals, while much of the original structure such as tree rings in retained. For this to happen the wood needs to be buried in an environment both low in oxygen (preventing decomposition) and with flowing, mineral-laden water. The coloration is due to the various minerals that are present during fossilization. For example red colors are due to iron compounds, greens due to copper, etc.