Thanks for your response Brittany.
In the last paragraph, I recall the tour guide opening a box with moulded, cuboid-shaped figures/samples. I described one of the layers as obsidian but now realise it could have actually been onyx.
Also, there was another layer to the samples that looked like yellow, crystalised fruit or something. I’d never seen anything like it before so disregarded it. But I now realise it was a layer of bdellium (only because I looked it up after reading about it in Genesis 2:12 and it reminded of the dream).
Don’t know but still seeking an interpretation for this dream.