Optical Calcite Iceland Spar 57g Rectangular Display Specimen |36x24x24mm|Clear|RARE!! ICELAND SPAR CALCITE 57g RECTANGULAR DISPLAY SPECIMEN!!! This stunning rectangular 57g Iceland Spar specimen is a beautiful example of optical calcite with brilliant clarity and natural geometric form. Measuring 36x24x24mm, 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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