Horn Silver Sphalerite is one of our favorite materials. Fluorescent in all wavelengths with an amazing array of colors, phosphorescent, and triboluminescent to boot. Here's a great specimen from one of the early collectors who had access to the material from the Horn Silver Mine in Utah. Previous posts have some great information about the mine, and stay tuned for Glow Notes post shortly that will have even more information.
This piece is about 5 inches long, by 3.5 inches tall. A, B, and C sides are shown in LW, MW, SW, LW phosphorescence, and natural. As a fun addition, we've added a C side triboluminescent image. Amazingly, the material even glows with a scratch of a fingernail.