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?

this beauty came as one of several surprises with my ebay purchase of a vitro tiger eye.

any ideas?

Very new to this, picked this board and marbles up from an op shop today. I think some of the marbles may be vintage but some may have been replaced with more modern ones?
Just after some thoughts please :)

Thank you!

Are these Vitro wedding cake marbles?