I checked it over and I think it has a little bit of mica in it.The bottom middle one of the first pic might be the best. Take it outside on a sunny day and see if there are sparkles: gold (Lutz), silver (Mica), or green (Aventurine). Most are German except the less fancy ones in the first pic.
I got a funny story to tell I was digging a hole one day and I was on my knees trying to get the bottle out and I felt something under my knee I just figured it was a pebble went to move my knee and look cuz it was bothering me so much there was a big swirl marble underneath my knee it wasn't a rock at all was a big swirl marble LOLHere they are and are mostly swirls, or handmade German, marbles. I got the three big ones in a bottle trade. I dont know the type names or value. The.largest big one is over 2".