Database of Zeolite Structures
 
 
Framework Type HEI
Framework
Cell parameters: monoclnic C 1 2/c 1 (# 15)
    a = 36.7640 Å b = 14.6100 Å c = 10.1890 Å  
  α = 90.000° β = 105.641° γ = 90.000°  
Volume = 5556.5 Å3  
RDLS = 0.0031  
  Framework density (FDSi): 17.6 T/1000 Å3  
  Topological density: TD10 = 858  
Essential rings: [122·83·71·54·48]  
Channel dimensionality: Topological (pore opening > 6-ring): 3-dimensional  
  Maximum diameter of a sphere:  
  that can be included 5.38 Å  
that can diffuse along a:   3.41 Å b:   3.41 Å c:   4.81 Å  
Accessible volume: 10.40   %  
Composite Building Units:
d4r (t-cub )
  Chains: dzc
Natural Tiling t-cub t-kdk t-hei-1
Framework images
(click on icon for larger image)

Viewed along [001]

projection along [001]
projection along [100]
projection along [010]
12-ring channel viewed normal to [001]
8-ring channel between the 12-ring channels viewed normal to [100], showing the limiting 8-ring in green.
projection along [001] showing diffusion pathways along x (red) and y (blue)

 


Year code assigned 2026
Data last updated March 16, 2026