Database of Zeolite Structures

Framework Type ERI
Reference Material
  Material Name: Erionite    
Chemical Formula:
|(Ca,Na2)3.5 K2 (H2O)27| [Al9Si27O72]-ERI
Unit Cell:§

 P 63/m m c (# 194)
    a' = 13.2700 Å b' = 13.2700 Å c' = 15.0500 Å  
    α' = 90.000° β' = 90.000° γ' = 120.000°  
Framework Density:
15.7 T/1000 Å3
[001] 8 3.6 x 5.1***
  Sorption (molecular cross section > 3.4Å): 3-dimensional
  Topological (pore opening > 6-ring): 3-dimensional
  Staples, L.W. and Gard, J.A.
  "The fibrous zeolite erionite; its occurrence, unit cell and structure"
Mineral. Mag., 32, 261-281 (1959)
Material name:   Erionite
Chemical formula:   [Al9Si27O72]-ERI
  § Gard, J.A. and Tait, J.M.
  "Refinement of the crystal structure of erionite"
Proc. 3rd Int. Conf. Molecular Sieves, , pp. 94-99 (1973)
  Kawahara, A. and Curien, H.
  "La structure cristalline de l'érionite"
Bull. Soc. fr. Minéral. Cristallogr., 92, 250-256 (1969)
Material name:   Erionite
Chemical formula:   [Al9Si27O72]-ERI
  Schlenker, J.L., Pluth, J.J. and Smith, J.V.
  "Dehydrated natural erionite with stacking faults of the offretite type"
Acta Crystallogr., B33, 3265-3268 (1977)
Material name:   Erionite
Chemical formula:   [Al9Si27O72]-ERI
Name and Code derivation:
§ Chemical Formula and Unit Cell taken from the reference marked with this sign
Limiting Rings
8-ring viewed normal to [001]