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Nacrite
Nacrite
Al
2
Si
2
O
5
4
is a
clay mineral
that is
polymorphous
with
kaolinite
. It
crystallizes
in the
monoclinic system
.
X-ray diffraction analysis
is
required
for
positive
identification
.
Nacrite was first described in
1807
for an
occurrence
in
Saxony, Germany
. The name is from
nacre
in
reference
to the
mother of
pearl
luster
of nacrite
masses
.
