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Webster's 1913 Dictionary
PERTHITE
Perth
"ite, n.
Etym:
[
So
called
from
Perth,
in
canada.
] (
Min.
)
Defn: A
kind
of
feldspar
consisting
of
a
laminated
intertexture
of
albite
and
orthoclase,
usually
of
different
colors.
--
Per
*thit "
ic,
a.