Pyroxene-ideal
	Thompson R M, Downs R T
	American Mineralogist 89 (2004) 614-628
	Model pyroxenes II: Structural variation as a function of tetrahedral rotation
	model with O3-O3-O3 angle = 240 and model oxygen radius = 1
	Note: Atoms Mg, Si, and O are assigned to atomic positions for convenience
	_database_code_amcsd 0003471
	7.394 6 3.464 90 117.9 90 C2/c
	atom x y z
	Mg1 0 11/12 1/4
	Mg2 0 .25 1/4
	Si 5/16 1/12 19/48
	O1 1/8 1/12 5/24
	O2 3/8 .25 7/24
	O3 3/8 11/12 7/24
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