14hhtj.t ((CORUNDUM variety RUBY)), UVLW red Fluorescent, $5 MINIMUM BID, Mundarara Mine, Arusha Region, Tanzania, 3 x 1.7 x 1.4 cm, Thumbnail | |
A hexagonal Ruby crystal that actually is Fluorescent under the inexpensive Long Wave Fluorescent Lamps (black light lamps). |