Corundum (Var: Ruby)
Mundarara Mine, Longido District, Arusha Region, Tanzania
Shown here is a pretty nice specimen of corundum var. ruby from the Mundarara Mine, Longido District, Arusha Region, Tanzania. Its fluorescence is not very bright, but it is a beautiful, deep saturated red. Just bright enough for a display, if placed closer to the lamp.
The specimen is shown in visible light in the second image.