ERI: Type Material

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:^§	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

Limiting Rings

8-ring viewed normal to [001]

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