Iceland spar, formerly called Iceland crystal (Icelandic: silfurberg [ˈsɪlvʏrˌpɛrk], lit. 'silver-rock') and also called optical calcite, is a transparent variety of calcite, a crystallized calcium carbonate, originally brought from Iceland and used in demonstrating the polarization of light. == Formation and composition == Iceland spar is a colourless, transparent variety of calcium carbonate (CaCO3).
Iceland spar, formerly called Iceland crystal (Icelandic: silfurberg [ˈsɪlvʏrˌpɛrk], lit. 'silver-rock') and also called optical calcite, is a transparent variety of calcite, a crystallized calcium carbonate, originally brought from Iceland and used in demonstrating the polarization of light. == Formation and composition == Iceland spar is a colourless, transparent variety of calcium carbonate (CaCO3).
Source: Wikipedia "Iceland spar" · CC BY-SA 4.0
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