Beryl (Var: Emerald), Chrysoberyl (Var: Alexandrite)
Magara mine, Lake Manyara, Arusha Region, Tanzania
Emerald (green) with portions of alexandrite attached (grey-green, right) from the Magara mine, Lake Manyara, Arusha region, Tanzania. Under 365 nm ultraviolet light the alexandrite fluoresces bright red while the emerald does not - see accompanying picture. Philip Hitge specimen
© Bruce Cairncross