#WhatAGeologistSees
Not a carbonates guy, but suspect this is “black marble”…which could be marketed as just about anything…but likely “Black Granite”!
Now it’s your turn. A spot of strong vinegar in a back corner and see if it fizzes after a bit.
I would imagine the igneous rock Henning suggests is correct…a weird rock composed of dark feldspar and still likely sold to dumb Americans as “Black Granite” 🤣