sapphire-double-refraction

Sapphire stone producing double refraction.

Investigating the double refraction phenomenon in a precious stone, perhaps a sapphire.

A man mesmerized by the double refraction phenomenon produced by this sapphire stone. (Photo credit: Internet Archive Book Images (https://www.flickr.com/photos/internetarchivebookimages/). This photo has been cropped and resized for use on this site.)

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