“February 2012 Specimen of the Month: Calcite (CaCO3)” by wagnerfreeinstitute is marked with CC BY-NC-ND 2.0.

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[Photo] Viking “Sólarsteinn” Sunstones Used For Navigation – Iceland Spar

By: Linus Koepcke, Journalist

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"February 2012 Specimen of the Month: Calcite (CaCO3)" by wagnerfreeinstitute is marked with CC BY-NC-ND 2.0.