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A "Mosser" or piece of slag from Low Wood near Backbarrow

Open hearth slag

Basic Bessemer slag

Blast furnace slag

Copper slag from old smelting works

Refinery slag from the Hafod Copper Works, Swansea

Crystals on the surface of tin-slag and in cavities

Crystals on the surface of tin-slag and in cavities

Roaster slag from the Haford Works, Swansea

Tin slag, glassy form

Ancient lead slag from Laurium, Greece

Ancient lead slag from Laurium, Greece

Slag containing vanadium from Eisleben

Refinery slag from the Hafod Copper Works, Swansea

Blast furnace slag

Run slag, from Llanelly Lead Works

Run slag, from Llanelly Lead Works

Crushed blast-furnace slag, 3/4" chippings

Rich slag, from a previous process

Rich slag, from a previous process

Copper slag from old smelting works

Piece of slag running out from the mass, called "Fox-tail"

Roaster slag from the Haford Works, Swansea

Medieval blast furnace slag from near Uckfield, Sussex

Tin slag, glassy form

Slag containing vanadium from Eisleben

Blast furnace slag

Blast furnace slag

Blast furnace slag

Electro-slag refined steels

Crushed blast furnace slag, 1/8" chippings

Foamed blast-furnace slag