Iceland spar, also known as Iceland crystal (Icelandic: silfurberg), is a transparent variety of calcite.
It is possible that the sunstone (Old Norse: sólarsteinn) mentioned in medieval Icelandic texts was Iceland spar, and that Vikings used for navigational purposes.
Average dimensions: 2.5 - 3 cm x 1.5 cm height. The price is for one piece.
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