yes it is. I remember there was an islamic geologist who went to the Kaaba and circled it when the doors were being refurbished. He got a good look at the stone and said it’s definitely an iron meteorite from the asteroid belt.
There used to be a buddha-like statue atop the cube, but the muzzies got rid of it long ago. There was also a sort of procession of statues leading up to the site; the last of the statue bases/pedestals were removed during the 20th century.