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iolite - viking compass?

iolite & moonstone necklace

compositiona complex magnesium aluminum
name sourcefrom the Greek ios meaning "violet," and lithos, meaning "stone"
other accepted namescordierite, dichroite, lynx sapphire, bloodshot iolite
historical aliaseswater sapphire (no longer accepted)
folkloric aliases"Viking's compass"
color light to dark blue and violet to colorless
color sourceiron and magnesium
significant sourcesBrazil, India, Madagascar, Myanmar (Burma), Sri Lanka
MOH scale7 - 7.5
care and treatmentWash in warm soapy water or clean in an ultra sonic jewelry cleaner.