Iceland spar is a transparent variety of the mineral calcite, known for its remarkable optical properties, particularly its ability to exhibit double refraction or birefringence. When light passes through Iceland spar, it splits into two separate beams, creating a noticeable double image. This property has made Iceland spar valuable in optical applications. Traditionally, Iceland spar has been used in the making of polarizing microscopes, optical instruments, and as a component in various scientific experiments.
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