Specimen of Ulexite, sometimes called TV Rock

This specimen came from Boron, California. It is called TV Rock because, if you place it over an image, the image appears to be at the top of the rock, as on a TV screen. The fibers of Ulexite act as optical fibers, transmitting light along their lengths by internal reflection. Much more detailed information can be found on the web.

Details

Date Purchased in 2015
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Category
Ref no N1634