Shipwreck may contain near-mythical Viking navigation aid

An oblong crystal found in the wreck of a 16th-century English warship is a sunstone, a near-mythical navigational aid said to have been used by Viking mariners, researchers said on Wednesday. The stone is made of Iceland spar, a transparent, naturally-occurring calcite crystal that polarises light…

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Shipwreck may contain near-mythical Viking navigation aid

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