Metallic primers for pistol and rifle are made from brass. The shiny ones have been nickel plated. Whenever you deprime brass, you should always save the spent primers, and when you take in any brass that can't be reloaded and sell it for scrap, also take the spent primers. My recycler likes to see them separate, but then when he weighs what I've brought in, he just pours the coffee can full of spent primers in with the rest of the brass. A coffee can full of spent primers is worth about $25.00 at the current rates.
Shotgun primers are made from steel. I recycle them, too, but only get about .06 cents a pound for them, whereas I'm getting about $1.40 a pound for brass. At least that was about two months ago, but it's probably gone up again by now.
Hope this helps.
Fred