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| Ulexite From California |
Also known as TV rock, Ulexite has unusual optical properties. I it a fibrous rock.
If it is cut vertically to the fibers and polished, You can observe these properties.
I bought this sample at a show.
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| Ulexite |
The fibers make this image appear blurred but it is sharply focused.
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| Ulexite |
Its chemical formula is (NaCaB5O6(OH)6·5H2O) (hydrated sodium calcium borate hydroxide) according to Wikipedia.
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