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Knebelite
Knebelite
is a
manganese
variety
of the fayalite-tephroite
series
with
formula
2
SiO
4
. It forms
dark green
orthorhombic
crystals
. It is
reported
from a variety of
locations
in
Sweden
as well as
South Africa
,
Russia
,
British
Columbia, New Hampshire
, and
Rhode Island
.