This Specimen has been sold.
.9" Black Tourmaline (Schorl) Crystal - Namibia
This is a black tourmaline (schorl) crystal that was collected from the Erongo Mountains in Namibia.
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.