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

Channels:

[001] 8 3.6 x 5.1*** Dimensionality   Sorption (molecular cross section > 3.4Å): 3-dimensional   Topological (pore opening > 6-ring): 3-dimensional

	References:
		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:
		Erionite   ERI

§	Chemical Formula and Unit Cell taken from the reference marked with this sign