Optical Calcite Iceland Spar 56g Rectangular Display Specimen| 32x30x21mm| ClearRARE!! ICELAND SPAR CALCITE 56g RECTANGULAR DISPLAY SPECIMEN!!! This stunning rectangular 56g Iceland Spar specimen is a beautiful example of optical calcite with brilliant clarity and natural geometric form. Measuring 32x30x21mm, this display crystal showcases the dazzling double refraction that Iceland Spar is known for an optical phenomenon that continues to amaze collectors, makers, and scientists alike. Revered for centuries, Iceland Spar has
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