Slag is stony waste matter separated from metals during the smelting or refining of ore. Slag is often mistaken for a meteorite or a fossil.
Tetris L, via Wikimedia Commons
Penn Dixie Fossil Park & Nature Reserve
Unearth the Unexpected!
Slag is stony waste matter separated from metals during the smelting or refining of ore. Slag is often mistaken for a meteorite or a fossil.
Tetris L, via Wikimedia Commons