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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) Hardness
on Mohs Scale:
(schorl)
7.5 Location: Erongo Mountains, Erongo Region, Namibia. Specimen Code: NERS 003 US $ 65
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