Optical Calcite / Iceland Spar Crystal
Product Info
Optical Calcite / Iceland Spar Crystal
Size: 65x45x20mm
Calcite is transparent to opaque and may occasionally show phosphorescence or fluorescence. A transparent variety called Iceland spar is used for optical purposes. Single calcite crystals display an optical property called birefringence (double refraction). This strong birefringence causes objects viewed through a clear piece of calcite to appear doubled.