Common Opal - Virgin Valley, Nevada
Click to enlarge
Click to enlarge
Normal light
Shortwave ultraviolet
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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