Neatorama Posts Tagged "iceland spar"
Viking Sunstone...

Legend has it that the Vikings used a na...  ...experiments have shown that a crystal, called an Iceland spar , could detect the sun with an accurac...  ...n was below the horizon. An Iceland spar , which is transparent and made of calcite, was fo...

https://www.neatorama.com/2013/03/07/Viking-Sunstone/
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