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 low clinopx with
	O3A-O3A-O3A angle = 180, O3B-O3B-O3B angle = 120, and model oxygen radius = 1
	_database_code_amcsd 0003509
	7.559 6.928 4 90 105.3 90 P2_1/c
	atom x y z
	Mg .2413 2/3 .2040
	Mg .2413 0 .2040
	SiA .0560 1/3 .2780
	SiB .5647 5/6 .1990
	O1A .8880 1/3 .1940
	O2A .1120 1/2 .3060
	O3A .1120 .25 .5560
	O1B .3707 5/6 .1020
	O2B .6293 0 .3980
	O3B .6293 2/3 .3980
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