steeelslinger- you should get in touch with CMB (above)- he is a great guy and generous with his trades!(thanks again carson) That rock IS obsidian, glass buttes rainbow by the look of it- however it doesn't look like it would be good for knapping. I also have some staves, and I live out at the coast- but CMB is closer to where you live. Collecting bowstaves is as simple as driving out to the coast range (tillamook state forest) and looking for some vine maple. vine maple dries fast and makes a good beginner bow wood. It's plentiful and fairly easy to ID by it's smooth green bark with moss covering it.
good luck!