I Hail From a Frigid Land, But My Color and Name Evoke the Sultry Tropics

GREENLANDITE, TANZANITE, andalusite … hear their names and you can be fairly sure of their provenance. I, on the other hand, was discovered in the frigid Ilmensky Mountains in central Russia but named for a vast tropical region half a world away where no green feldspar has ever been found. The exact source of my sultry greenness remains something of a mystery, although lead appears to play a role. I’m more ornamental than precious — but a collector’s piece nonetheless.

Who am I?