Hello. Welcome.
I found it! Wasn't optimistic at first but sure enough this looks like a match.
John Lewis 300 Piece Marble Run Coaster
http://www.johnlewis.com/john-lewis-300-piece-marble-run-coaster/p1903921
I shouldn't have narrowed my guess to Mexican. I do remember now reading about onxy being quarried in the Southwestern U.S.
I don't know about Alabaster.
Those would be some nifty and unusual foreigns if that's what they are.
I like the hybrid Whitie idea, but would the wideness of the purple ribbon work against that guess?
Translation: I can't help you narrow this down.
I dunno. That's weird. I tried to post one of your pics myself and it came up as a link for me also.
Your Maybe-Vitros showed up okay in the other thread. Could it possibly be the space in the picture address?
(Edit: After I hit submit that picture showed up. I had the address in IMG tags, which we don't usually need anymore.)
euphuist -- One who affects excessive refinement and elegance of language; applied especially to a class of writers, in the age of Elizabeth I, whose productions are marked by affected conceits and high-flown diction.