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New to knapping, help woth rock ID?

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Ippus:
Hey, y'all. I recently finished my first bow, and I'm starting on arrows. Eventually, the goal is to knap my own hunting broadheads, but for now I'm still at the trying-to-identify-knappable-rocks stage. Any tips on how to do that in SE Idaho would be appreciated. The geology around here seems to be a sort of random combination of limestone and volcanic.

I picked this rock up on a trail run earlier today. Based on the few youtube videos I've seen, it looked likely. Any idea what it is, or if I'm on the right track?

Dakota Kid:
Looks pretty grainy to me. When I was a newb, I started with man made glass. It's free and plentiful, and more especially it knaps beautifully. Find an old school TV someone wants to get rid of. The picture tube glass is nearly an inch thick and works great. I'd watch a youtube video on how to safely remove it. They are under vacuum and can implode if you don't first slowly even out the pressure.

Orrum:
Yes start with man made glass. For a year my girlfriend wold see me get my knapping stuff out and ask.....what are you breaking this time!#!   Now after 2 years I can make tomahawks really good with little breakage. Arrowheads fairly good but still break some, notching is tricky still. Blads I break about half and make them into neck knices or points. But rember I am doing percussion primarily. So just get some tools and start, it's amazingly satisfying to me even if I break something! Remember if you ain't bleeding you ain't knapping! LOL. It's a blood sport!

Chippintuff:
That rock looks tough enough to be a hammer stone. Where it breaks you want to see a smooth surface.

WA

mullet:
Looks like "Leaveitright". ;)

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