Morta
Several pipe makers are using Morta, which is an excellent material for pipe making. Morta, or bog oak, is partially petrified oak. Bog wood is from trunks of trees that have fallen, and been buried in peat bogs. This preserves them from decay due to the acidity and anaerobic bog conditions. Over the coarse of time, the tannins are leached out, leaving the wood in the early stages of fossilization. If the process continues, the wood ultimately turns into lignite and coal over a period of many millions of years.
Trever Talbert made "The Scallop" a beautiful example of Morta pictured on the right, and is one pipe makers who have made Morta a regular part of their pipe making. For more great examples of Trever's Morta pipes see Trever's Morta Pipe Gallery. Trever also describes the process of finding, harvesting, curing, and making pipes from Morta on the following pages here.