Optical Calcite

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While calcite is the most common mineral next to quartz, optical calcite is less common. It is shaped like a stretched rectangle and is semi-clear to clear with a glassy luster. It can make objects placed behind it appear doubled. Flawless specimens are valued for their use in optical instruments. *Please note these are sold individually. Since they are a natural product and unique they may vary in size, color, and shape. Show more