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Zeolites
have
been
recognized
as
3D
framework
materials
but
are
now
known
to
also
exist
in
various
2D
layered
forms
with
sheets
of
one
unit
cell
or
smaller
thickness.
We
propose
a
classification
system
and
an
expanded
concept
of
zeolite
structures
integrating
various
2D
and
the
traditional
3D
forms.
Zeolite
topology
is
defined
as
the
primary
structure.
Various
kinds
of
zeolite
mono-layer
assemblies
are
secondary
structures.
Based
on
the
literature
15
distinct
layered
forms
are
recognized.
A
detailed
table
is
generated
showing
layered
forms
that
have
been
reported
for
various
topologies.
It
provides
a
classification
tool
for
recognition
and
verification
of
known
materials.
It
may
be
used
to
identify
unknown
ones
of
particular
interest
to
pursue.