The left is ~7.25x2 and is a deep gold color with a speckled white streak pattern that looks very porous It has some very faint dark patterns spreading through it and some red veins that I suspect are iron deposits.The BBW matches the streak pattern and has a couple small white/peach spots, but is otherwise unremarkable.
The right is ~7.5x1 and is a light yellow with a few shadows and some light brown freckles that look like tiny grains of rice. It's the thickest yellow coti I have. ~12-14mm thick I'd guess. The bottom half is completely unpatterned and smooth, It looks like a Dark Blue Thuringian with the BBW sparkles throughout it. It's very thin ~4-5mm. I'm not 100% convinced it's BBW. It may be some kind of slate for all I know.