Material Name:	ZSM-18
	Chemical Formula:	|Nax (H2O)28 | [AlxSi34-xO68]-MEI  (x=2.1-5.7)
	Unit Cell:	hexagonal	P 63/m (# 176)
		a' = 13.1750 Å	b' = 13.1750 Å	c' = 15.8480 Å
		α' = 90.000°	β' = 90.000°	γ' = 120.000°
	Framework Density:	14.3 T/1000 Å3

Channels:

[001] 12 6.9 x 6.9* <-> [001] 7 3.2 x 3.5** Dimensionality   Sorption (molecular cross section > 3.4Å): 1-dimensional   Topological (pore opening > 6-ring): 3-dimensional

	References:
		Lawton, S.L. and Rohrbaugh, W.J.
			"The framework topology of ZSM-18, a novel zeolite containing rings of three (Si,Al)-O species"
			Science, 247, 1319-1321 (1990)

	Name and Code derivation:
		Zeolite Socony Mobil - eighteen   ZSM-18 (eighteen)   MEI