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The black one looks like slate, possibly a good one from the size, sawmarks and slurry.
The white one looks like possibly a hindostan from the photo, but may be an ark, or greek, though arks and greeks are hard to slurry that much. Do you have a photo of the side of the stone?
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The Special Stones that we talked about earlier, had that shiny metallic sheen, like yours and I think the size might match. Either way it is probably a nice slate finisher.
Be careful lapping on a Diamond plate, do in a pond under water, or they will eat your diamond plate.
A Hindo will have visible layers on the sides and end looking like wood grain. Did it come completely clean, and stop releasing oil?
Because it looks like a dirty Lilly White in the photo, but I am more concerned by the amount of slurry, Arks will not release that much slurry with out a lot of pressure and laps.
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1 Attachment(s)
Check out this thread post 33 for photos of a Special Stone with measurements, it does look similar to yours.
Here
Attachment 191344
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White one is still likely a Washita. There's no telling what the slate is. There are any number of slates that fit the criteria.