1. If American, it might be an Akro slag. The fingernail polish texture of the white makes me think it might be nonAmerican though.
2. A "clearie". Practically impossible to narrow down to any one company. A popular marble back in the day. The Vitro Agate version of clearies helped save their company in the 1950's when Asian cat's eyes were having such a large impact on the American marble market.
3. Interesting. One longish skinny patch? I'm considering Peltier, but don't have a strong feeling about it.
4. A real stone marble. You can see from the many moons in it that someone played with it a lot.
5. I would call this another clearie, even though the backlight shows intersting color variations.
6. While this has similar coloring to #4, it appears to be glass. Whatever it is, it looks special to me. I'm thinking it could be an uncommon style from whatever company it turns out to be from.
7. Master