Common Opal - Virgin
Valley, Nevada
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Normal light
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Shortwave
ultraviolet
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Common Opal has the
appearance of a chunk of broken glass. Although
it is not glassy, it has a semi gloss surface. It's green
fluorescence is
caused by a trace amount of uranium within the mineral. I confirmed
this
with my Geiger counter. The amount of radioactivity is small but
detectable.
The size of this specimen is 2
1/2" long X 1 1/4" wide X 1 1/8" thick.
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