Rebekah Zaveloff It looks like a honed black granite with a larger crystal structure than absolute black.

http://www.marble-granites.com/products/Granite/Antique-Pearl.aspx?p=191

andyhoffmann The island is antique brown granite, the perimeter is seashell marble, both honed.

scotia I think that the island is slate

Dewson Construction Company Thank you andyhoffmann ... she is the owner and designer of this home.