Periodic Building Unit (PerBU):  CFI layer  
Layer symmetry  P m m (2)  
Comment  To facilitate understanding of the connectivity patterns shown below, O atoms that connect to a single row of d4r units have been highlighted in the CFI layer shown to the right. 

Connecting unit  d4r  
Examples 

Second row identical to first with no shift along a  Second row shifted by 1/2a with respect to first 
Examples 
 
^{*} relative to the previous layer of connectors 
Polymorph CIT13_A  
Cell Parameters:  orthorhombic  C m m m (# 65)  
a = 27.2188 Å  b = 13.9547 Å  c = 10.5278 Å  
α = 90.0000°  β = 90.0000°  γ = 90.0000°  
Volume =  3998.8 Å^{3}  
Framework Density (FD_{Si}):  16.0 
Ring sizes (# Tatoms):  14 10 6 5 4  
Channel dimensionality:  Topological (pore opening > 6ring): 2dimensional 
Maximum diameter of a sphere:  
that can be included  8.29 Å  
that can diffuse along  a: 2.38 Å  b: 4.28 Å  c: 7.5 Å  
[0 0 1] : 7.5 Å  
addional volume data 
Composite Building Units: 
d4r  mtt  cas  non  ton  
In this space group and setting, the ordered connecting rows are along [001] and the layers are stacked along [100] 
Note: This polymorph has NOT been observed as a pure ordered material  
Polymorph CIT13_B  
Cell Parameters:  orthohombic  I m m m (# 71)  
a = 27.0454 Å  b = 13.6820 Å  c = 10.2908 Å  
α = 90.0000°  β = 90.0000°  γ = 90.0000°  
Volume =  3808.0 Å^{3}  
Framework Density (FD_{Si}):  16.8 
Ring sizes (# Tatoms):  14 10 6 5 4  
Channel dimensionality:  Topological (pore opening > 6ring): 2dimensional 
Maximum diameter of a sphere:  
that can be included  8.28 Å  
that can diffuse along  a: 2.04 Å  b: 3.83 Å  c: 7.24 Å  
[0 0 1] : 7.24 Å  
addional volume data 
Composite Building Units: 
d4r  mtt  cas  non  ton  
In this space group and setting, the ordered connecting rows are along [001] and the layers are stacked along [100] 
Note: This polymorph has NOT been observed as a pure ordered material  
Polymorph CIT13_C  
Cell Parameters:  orthorhombic  C m c m (# 63)  
a = 10.4578 Å  b = 27.7606 Å  c = 27.2022 Å  
α = 90.0000°  β = 90.0000°  γ = 90.0000°  
Volume =  7897.3 Å^{3}  
Framework Density (FD_{Si}):  16.2 
Ring sizes (# Tatoms):  14 10 6 5 4  
Channel dimensionality:  Topological (pore opening > 6ring): 2dimensional 
Maximum diameter of a sphere:  
that can be included  8.14 Å  
that can diffuse along  a: 7.45 Å  b: 3.92 Å  c: 2.22 Å  
[1 0 0] : 7.45 Å  
addional volume data 
Composite Building Units: 
d4r  mtt  cas  non  ton  
In this space group and setting, the ordered connecting rows are along [100] and the layers are stacked along [001] 
Note: This polymorph has NOT been observed as a pure ordered material  