Petrified wood kupengaSmall Medium petrified wood taonga in a black kupenga netting and adjustable tie. Petrified wood is a name given to a special type of fossilized wood. This happens when wood is buried under ash, mud or other debris depriving the wood of oxygen. Petrification happens when water containing silica and minerals penetrates the trees cell walls and replaces the water with different elements or compounds like quartz causing them to harden over time, thus