Fabled sunstone a guide to seas

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Fabled sunstone a guide to seas

Researchers say rock may have helped medieval sailors navigate
Researchers say the Alderney Crystal, a piece of calcite recovered from the wreckage of 16th century English warship, may be a sunstone, a special kind of mineral believed by some to have helped medieval seafarers navigate the high seas.

Fabled sunstone a guide to seas

Researchers say the Alderney Crystal, a piece of calcite recovered from the wreckage of 16th century English warship, may be a sunstone, a special kind of mineral believed by some to have helped medieval seafarers navigate the high seas.
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