Middle Ages Blue Antiq Slag Piece

700+ year old Slag from medieval refineries in the Harz mountains in Germany. Similiar material is also referred to as siebert agate, blue antiq amber, and leeland blue stone.

its history makes it a great piece to add to any mineral colletion.

It has a beautiful deep blue color, with unique swirling patterns, perfect for processing and tumbling.

you will get one hand picked piece by our team.