Crystal found in shipwreck confirmed to be calcite

03/6/2013 | ScienceMag.org

A small crystal stone discovered in a 16th-century British shipwreck off the island of Alderney has been confirmed to be made of calcite, according to a study published in the Proceedings of the Royal Society A. The confirmation supports an earlier theory that Vikings and other sailors used "sunstones" as a means to navigate waters on cloudy days.

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