Measurements: 86 x 65 x 56 mm
Description: A group of shiny, jet-black schorl (variety foitite) crystals, partially coated with feldspar. One end has a large (but not distracting) pressure mark, while the other end has a large contact mark.
Weight of Specimen: 311.7 g
Chemical Composition: NaFe2+3Al6Si6O18(BO3)3(OH)4 (schorl)
on Mohs Scale:
Location: Erongo Mountains, Erongo Region, Namibia.
Specimen Code: NERS 003
US $ 65