Material Name:	Sigma-2
	Chemical Formula:	|(AdaA)4 | [Si64O128]-SGT AdaA = C10H17N = 1-aminoadamantane = adamantan-1-amine SMILES: C1C2CC3CC1CC(C2)(C3)N   Images:  stick or 3D
	Unit Cell:	tetragonal	I 41/a m d (# 141)
		a' = 10.2390 Å	b' = 10.2390 Å	c' = 34.3830 Å
		α' = 90.000°	β' = 90.000°	γ' = 90.000°
	Framework Density:	17.8 T/1000 Å3

Channels:

apertures formed by 6-rings only Dimensionality   Sorption (molecular cross section > 3.4Å): 0-dimensional   Topological (pore opening > 6-ring): 0-dimensional

	References:
		McCusker, L.B.
			"The ab initio structure determination of Sigma-2 (a new clathrasil phase) from synchrotron powder diffraction data"
			J. Appl. Crystallogr., 21, 305-310 (1988)

	Name and Code derivation:
		Sigma-2 (two)   SGT