Measurements: 90
x 55 x 47 mm
Description:
A group of shiny, jet-black schorl (variety foitite) crystals with
multiple
terminations and interesting facets. The specimen is partly
covered with
white feldspar.
It has
a large pressure mark to one end, a few small nicks and damage at the
bottom
where it parted from its matrix.
Weight
of Specimen: 322.7 g
Chemical
Composition:
NaFe2+3Al6Si6O18(BO3)3(OH)4
(schorl)
KAlSi3O8
(feldspar)
Hardness
on Mohs Scale: (schorl)
7.5
(feldspar)
6
- 6.5
Location:
Specimen
Code: NERS 002
US $ 75
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