Jet-black Ogatsu stone, with a history spanning over 200 million years

TheblacktilesadorningthewallaremadefromGenshostone,ablack,hardshalethatoriginated250millionyearsagoItiscalled"Ogatsustone"asitisminedinOgatsuTown,IshinomakiCityTheOgatsuinkstoneswerepresentedtoDateMasamune,whoissaidtohavepraisedthemDuetoitsstrongresistancetoaging,itiswidelyusedinvariousapplications,includingtheroofmaterialsofTokyoStation'sMarunouchibuildinganddesignertableware