Teak
I've personally never seen teak used in a cue. As I understand it teak is used most in boating and in outdoor furniture for a few reasons. Most of which is that it's pretty impervious to weather. The vast majority of times I've seen teak used ANYWHERE it was in an unfinished state which ultimately oxidizes. Evidently that's desirable amongst teak afficianados. I was told the main reason it's not used in smaller quantities is the affect it has on cutters. Again, as I understand it the nature of teak is that it actually grows with sand/silicone imbedded in the grain as it grows. That's nastyyyyyyyyy stuff to machine and would eat cutters absolutely alive. If you look closely at unfinished teak furniture, you can actually see the sediment imbedded.
Vince.