| FLUORESCENT, TRIBOLUMINESCENT, PHOSPHORESCENT SPHALERITE, Horn Silver Mine, Milford, Beaver county, Utah, 3.5 x 2.5 x 1.5 cm | |
 | This is a very interesting specimen. It is an example of fluorescense, phosphorescense (emits light after the fluorescent source is turned off), and turboluminescense (emits light when stuck (looks like sparks but is not hot). |
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