Database of Zeolite Structures
 

Framework Type HEU
Reference Material
  Material Name: Heulandite    
 
Chemical Formula:		  
|Ca4 (H2O)24 | [Al8Si28O72]-HEU		  
   
Unit Cell: 		 
monoclinic
 C 1 m 1 (# 8)
    a' = 17.7180 Å b' = 17.8970 Å c' = 7.4280 Å  
    α' = 90.000° β' = 116.420° γ' = 90.000°  
   
Framework Density: 		 
17.1 T/1000 Å3
 
  
Channels: 		 
{[001] 10 3.1 x 5.5* + 8 4.1 x 4.1*} <-> [100] 8 2.8x 3.4* (variable due to considerable flexibility of framework)
Dimensionality
  Sorption (molecular cross section > 3.4Å): 1-dimensional
  Topological (pore opening > 6-ring): 2-dimensional
   
References:
  Alberti, A.
  "On the Crystal Structure of the Zeolite Heulandite"
Tschermaks Min. Petr. Mitt., 18, 129-146 (1972)
  Merkle, A.B. and Slaughter, M.
  "The crystal structure of heulandite (Ca,Na2)[Al2Si7O18]·6H2O"
Am. Mineral., 52, 273-276 (1967)
Material name:   Heulandite
Chemical formula:   [Al8Si28O72]-HEU
 
  
Name and Code derivation:
    Heulandite
  HEU
Limiting Rings
 
10-ring viewed along [001]

8-ring, also along [001]

8-ring viewed along [100]

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