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Measurements: 107
x 62 x 50 mm Description: A
group of multi-terminated schorl (variety foitite) crystals with a
glossy,
jet-black colour, partially coated with feldspar and a piece of quartz
conglomerate. The only notable damage is a contact mark at the
one end of
the specimen. Weight
of Specimen: 408 g Chemical
Composition:
NaFe2+3Al6Si6O18(BO3)3(OH)4
(schorl) Hardness
on Mohs Scale: (schorl)
7.5 Location: Specimen
Code: NERS 005 US $
200
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