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Blue slag is a man-made rock created as a by-product of iron smelting. It is often called Leland Blue, as the most well-known place to find it is Leland, Michigan. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. Blue slag is most often a robin’s egg blue, but I’ve seen greenish and purplish stones.
Blue slag is popular because of its aesthetic beauty and because it is a very unique and relatively rare type of rock. The type of iron smelting that produced blue slag was phased out in the late 19th century, so little to no blue slag is being created these days.
