Viking Sunstones Double refraction of Calcite quotIceland sparquot Viking solstein

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Three minerals from Scandinavia that may be the legendary Sunstones of the Norse navigators. Demonstration of the double refraction of Iceland spar (calcite)...

Viking, sunstone, Norse, navigation, feldspar, calcite, Iceland, polarization, spar, cordierite, cordieritt, feltspat, navigasjon, vikinger, skip, sólarsteinn
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