File:Ulexite on flickr (21734610).jpg

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Ulexite is a desert mineral that combines calcium, sodium, water molecules, and boron in a complicated arrangement. 

It forms in alkali salt flats where the local water is rich in boron. In rock shops, cut slabs of ulexite like this one are commonly sold as "TV rock." It consists of thin crystals that act like optical fibers, so if you lay it on a paper, the printing appears projected on the UPPER SURFACE, very hard to see on a 2D photo.
But if you look at it sideways the rock is not transparent at all.
Date
Source Ulexite on flickr
Author Dave Merrill from Perry, Utah, USA

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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
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This image was originally posted to Flickr by Utah~Dave AA7IZ at https://flickr.com/photos/33185390@N00/21734610. It was reviewed on 4 December 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0.

4 December 2018

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current13:35, 4 December 2018Thumbnail for version as of 13:35, 4 December 20181,909 × 1,340 (499 KB)Luisbrudna (talk | contribs)Transferred from Flickr via #flickr2commons

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