similar to H5507; probably a (black) tile (or tessara) for laying borders with; black marble.
Usages throughout the bible
Esther 1:6
-
Where were white, green, and blue, hangings, fastened with cords of fine linen and purple to silver rings and pillars of marble: the beds were of gold and silver, upon a pavement of red, and blue, and white, and black, H5508 marble.