Chessboard set - need help to ID materials
I just inherited an antique chessboard/set and since I have no knowledge of items like this, I'm looking for some help with it. Specifically, I'd like to know what its made of. A friend of mine told me that most boards are of the marble/onyx variety, and it seems this may be what I have here. Underneath the board there are slabs of stone pieced together. Just wondering if that could be a different type of stone.
If anyone has any ideas of what these materials might be I would greatly appreciate any info. Thanks and happy new year!