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Measurements: 133
x 69 x 50 mm Description: A
group of glossy, jet-black schorl crystals (variety foitite) on a
matrix of
quartz and schorl. The specimen is partially covered with
feldspar. The schorl group has no damage. Weight
of Specimen: 418 g Chemical
Composition:
NaFe2+3Al6Si6O18(BO3)3(OH)4
(schorl) Hardness
on Mohs Scale: (schorl)
7.5 Location: Specimen
Code: NERS 007 US $ 250 .. .
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