I have a potential locality for this stuff. Was researching this:    https://www.mindat.org/mesg-629464.html    so I assume the 2 might be correlated(likely sourced from the same dig site). Stone is lightly oiled, original texture is coarse and feels like it was coated in sugar(like quartzite), but you couldn't see the feldspar?  phenocrysts(if that is what those are ). Likely from abrasion since it was used for a road.

I have 2 specimens of this. Will post a total of 4 photos

This is Specimen A