Some Doublets Examples
This is a quick. So if you want detailed instructions let me know.

2.5 mm Morrisonite with a 3mm Basenite backing
6mm Rutilated Quartz Cab	Will look like this after glued to Basenite and polished
330 Epoxy Glue and an Iron	3mm Basenite Slab (Basalt)
Ochoco Tube Agate Slab	Ochoco Slab / Glue / Hot Iron
4mm cab 2mm Basenite	Needs to be cleaned up but you get the idea

Needs fine tuning and polish then she's all done.

Ochoco and Red Noreena...hmm... maybe I'll try that next time. :)