>NEW: Info to the keyword iolite | >discuss | >create link 
on Dec 30th 2004, 05:58:15, iolite wrote the following about

iolite

The Vikings used thin pieces of iolite as a polarizing filter. This enabled them to determine the exact position of the sun and so to navigate safely far out to sea.
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0.0036 (0.0019, 0.0004) sek. –– 164392086