Material Name:	Offretite
	Chemical Formula:	|(Ca,Mg)1.5K (H2O)14 | [Al4Si14O36]-OFF
	Unit Cell:§	hexagonal	P -6 m 2 (# 187)
		a' = 13.2910 Å	b' = 13.2910 Å	c' = 7.5820 Å
		α' = 90.000°	β' = 90.000°	γ' = 120.000°
	Framework Density:	15.5 T/1000 Å3

Channels:

[001] 12 6.7 x 6.8* <-> [001] 8 3.6 x 4.9** Dimensionality   Sorption (molecular cross section > 3.4Å): 3-dimensional   Topological (pore opening > 6-ring): 3-dimensional

	References:
		Bennett, J.M. and Gard, J.A.
			"Non-identity of the Zeolites Erionite and Offretite"
			Nature, 214, 1005-1006 (1967)
			Material name:   Offretite
			Chemical formula:   [Al4Si14O36]-OFF
	§	Gard, J.A. and Tait, J.M.
			"The crystal structure of the zeolite offretite, K1.1Ca1.1Mg0.7[Si12.8Al5.2O36]·15.2H2O"
			Acta Crystallogr., B28, 825-834 (1972)
		Alberti, A., Cruciani, G., Galli, E. and Vezzalini, G.
			"A reexamination of the crystal structure of the zeolite offretite"
			Zeolites, 17, 457-461 (1996)
			Material name:   Offretite
			Chemical formula:   [Al4Si14O36]-OFF
		Mortier, W.J., Pluth, J.J. and Smith, J.V.
			"The crystal structure of dehydrated natural offretite with stacking faults of erionite type"
			Z. Kristallogr., 143, 319-332 (1976)
			Material name:   Offretite
			Chemical formula:   [Al4Si14O36]-OFF

	Name and Code derivation:
		Offretite   OFF

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