Seiber “Agate” Copper Slag is 100+ year old slag glass from copper factories in Germany. Similar to Leland Blue Slag Glass found in Michigan.
Locality: Germany
Photos have not been edited or altered, just taken in different daylight conditions to show the variation in color. Pieces are held in hand to help with scale and does not necessarily represent 1 pound. Specific pieces photographed may no longer be available.