4.63" Schorl (Black Tourmaline) - Erongo Mountains, Namibia

This is a beautiful schorl, or black tourmaline crystal from the Erongo Mountains in Namibia. Although there are some minor abrasions, the crystal is in overall great shape, and is naturally terminated on one end.

Tourmaline is a crystalline boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Schorl, or black tourmaline, is the most common form of tourmaline, and has been used for everything from jewelry to piezoelectric guitar pickups.