You searched for: “rubellite
rubellite (s) (noun), rubellites (pl)
A red, usually transparent, crystalline or hard glassy mineral that is used as a gem and in optical and in electronic instrumentation: "The label in the box for the expensive watch, Laura received as a gift, stated that it had 14 rubellites in it."
This entry is located in the following unit: rub-, rubi- (page 1)