Cummingtonite
	Fischer K F
	American Mineralogist 51 (1966) 814-818
	A further refinement of the crystal structure of cummingtonite
	(Mg,Fe)7(Si4O11)2(OH)2
	_database_code_amcsd 0000145
	9.51 18.19 5.33 90 101.9 90 C2/m
	atom x y z occ Biso
	Si1 .2874 .0842 .2746 .36
	Si2 .2977 .1688 .7817 .43
	Mg1 0 .0872 1/2 .84 .38
	Fe1 0 .0872 1/2 .16 .38
	Mg2 0 .1773 0 .95 .36
	Fe2 0 .1773 0 .05 .36
	Mg3 0 0 0 .84 .30
	Fe3 0 0 0 .16 .30
	Mg4 0 .2597 1/2 .13 .79
	Fe4 0 .2597 1/2 .87 .79
	O1 .1135 .0874 .2087 .56
	O2 .1232 .1721 .7193 .67
	O3 .1134 0 .7067 .81
	O4 .3798 .2460 .7716 .89
	O5 .3514 .1310 .0659 .89
	O6 .3488 .1185 .5597 1.01
	O7 .3417 0 .2719 .88
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