Bog Iron and Iron Working in the Viking Period
The Snaptun Stone
image: World Tree Project
This stone was probably used to protect the belows from heat.
Egils Saga Ch 30
Skallagrim was a great blacksmith, and worked large amounts of bog-iron in the winter. He had a built by the sea some distance from Borg, at a place now called Raufarnes, where he thought the woods were not too far away. But since he could not find any stone there suitably hard or smooth enough for hammering iron on as there were nothing but beach pebbles, and fine sand along the seashore – one evening, when other were asleep, Skallagrim went to the sea, and pushed out one of his eight-oared boats, and rowed out to the Midfirth islands. There he dropped the stone anchor from the bows of the boat, then stepped overboard, and dived down to the bottom, and brought up a large stone, and lifted it into the boat. Then he climbed into the boat and rowed to land and carried the stone to the forge and laid it down before the smithy door, and always forged his iron on it. That stone is still there with a pile of slag beside it; and its top bears the marks of hammering. It has been worn by the waves and it is different from the other stones that are there. Four men today could not lift it.