u/Prestigious-Ease5890

Someone is selling this and ... it just doesn't look quite right?

Are these all the same quality/age/kind/grade of marble? Or are the differences between the three groups?

From the Tagus. There are lots and lots and lots of bones in the river, as in the Thames and other ancient urban rivers. But this one is odd since it seems to be filled with hardened sediment/clay. What does this look like to people?

-The chonkers in the first two pics are like .. sparklers with a semi-opaque base? what are they?
-third and fourth pics: are these Veiligglas?
-fifth and sixth: I think the blue ones are all different kinds of blue-and-white? And the green one has some kind of dimple that looks melted in?

seventh pic: cat likes marbles

This was a $10 batch of marbles I got on a local second-hand site. I think I did ok! So I know these are old German marbles, and though I don't know the exact taxonomy for them all (caged, divided core, etc???) I can recognize that two of them are onionskins...but what is this green thing?? it has a few flecks of mica in there. What do you call it?