Assertion: spinel cordierite | /r/HasProperty | viking stone
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Source sentences:
text: Yes, this is a stone with a lot of names and can be called in different way, the principal name is Iolite, the most used and correct name, other nomenclature for this stone are: iolite cordierite, water sapphire, dichroite, the viking stone this last given by the legend that say Vikings in ancient times used this crystal like a polarized filter to help them find the sun on cloudy days and to orientate during navigation.