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, closest-packed, ABABCACABCBC, with
	O3A-O3A-O3A angle = 240, O3B-O3B-O3B angle = 120, and model oxygen radius = 1
	_database_code_amcsd 0003508
	6.928 6 3.464 90 109.47 90 P2_1/c
	atom x y z
	Mg .25 2/3 1/6
	Mg .25 0 1/6
	SiA 1/16 1/3 3/8
	SiB 9/16 5/6 5/24
	O1A 7/8 1/3 1/4
	O2A 1/8 1/2 1/4
	O3A 1/8 1/3 3/4
	O1B 3/8 5/6 1/12
	O2B 5/8 0 5/12
	O3B 5/8 2/3 5/12
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