On-line Dictionary
Gneiss
Gneiss
n.
A
crystalline
rock
,
consisting
,
like
granite
, of
quartz
,
feldspar
,
and
mica
,
but
having
these
materials
,
especially
the
mica
,
arranged
in
planes
, so
that
it
breaks
rather
easily
into
coarse
slabs
or
flags
.
Hornblende
sometimes
takes
the
place
of
the
mica
,
and
it is
then
called
hornblendic
/
syenitic
gneiss
.
Similar
varieties
of
related
rocks
are
also
called
gneiss
.
URL of this page:
http://www.kvadrata.net/gneiss
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