Optical Calcite Iceland Spar 25g Rectangular Display Specimen| 27x26x12mm|Clear|RARE!! ICELAND SPAR CALCITE 25g RECTANGULAR DISPLAY SPECIMEN!!! This stunning rectangular 25g Iceland Spar specimen is a beautiful example of optical calcite with brilliant clarity and natural geometric form. Measuring 27x26x12mm, 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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