“For centuries, it has been a crystal of legend locked in the verses of Norse myth with little or no evidence that it was ever real. Now it seems scientists at last have grounds for believing that the Viking ‘sunstone’ used to navigate the seas did indeed exist.“
- Cahal Milmo, “Not just the stuff of legend: Famed Viking ‘sunstone’ did exist, believe scientists“, Independent (Mar. 6, 2013).
I need to do some more reading here. I’ve been under the impression we understood exactly what the sunstone was; no mystery here.