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Ulexite-39574.jpg(400 × 348 pixels, file size: 36 KB, MIME type: image/jpeg)


English: Ulexite
Locality: Boron, Kramer District, Kern County, California, USA (Locality at
This is a great example of the transparent and colorless mineral known as "TV rock" because it has optical properties like fiber-optic cable. It is transparent along the perfect vertical axis, while opaque along other axes. When polished, as this is, you can hold it over writing and witness this phenomenon. Is this a fine mineral specimen? No, not really. But it is really "neat" material and I wasn't sure those outside of California had been exposed to it. It does get sold widely to museums and rock shops, again labelled as "tv rock" or "fiber-optic rock". Fun for kids... 4.3 x 3.1 x 1.9 cm
Deutsch: Ulexit
Fundort: Bor, Kramer District, Kern County, Kalifornien, Vereinigte Staaten (Fundort bei
Date before March 2010


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current13:11, 25 April 2010Thumbnail for version as of 13:11, 25 April 2010400 × 348 (36 KB)RKBot== {{int:filedesc}} == {{Information |Description= {{en|1=Ulexite :: Locality: Boron, Kramer District, Kern County, California, USA ([
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