A rough, whitish block recovered from an Elizabethan shipwreck may be a sunstone, the fabled crystal believed by some to have helped Vikings and other medieval seafarers navigate the high seas, researchers say.
via Pocket http://www.cbc.ca/news/technology/story/2013/03/08/wrd-shipwreck-english-channel-viking-navigation-alderney-crystal.html
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