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Webster's 1913 Dictionary
PYROCHLORE
Pyr "o *
chlore,
n.
Etym:
[
Pyro-
+
Gr.
(
Min.
)
Defn: A
niobate
of
calcium,
cerium,
and
other
bases,
occurring
usually
in
octahedrons
of
a
yellowish
or
brownish
color
and
resinous
luster;
--
so
called
from
its
becoming
grass-green
on
being
subjected
to
heat
under
the
blowpipe.
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