Slag is an industrial byproduct of various industries, including metal smelting and glass working. These slag specimens are sold for students and geology classes, etc – as study pieces.
These pieces come from a range of locations, as slag is found all over the UK. It was widely used as hardcore for train track and road building, so is found in some really unlikely places!
For a full list of all of our related products, and more information about the ‘stone’ itself, please see our main ‘Slag’ section