Fluoro-eckermannite
	Oberti R, Hawthorne F C, Camara F, Raudsepp M
	American Mineralogist 84 (1999) 102-111
	Unusual M3+ cations in synthetic amphiboles with nominal fluoro-eckermannite
	composition: Deviations from stoichiometry and structural effects of the
	cummingtonite component
	Sample: Cr1, Na1.00Na1.97Mg.03Mg4.03Cr.97Si8O22F2
	_database_code_amcsd 0002059
	9.722 17.813 5.282 90 103.69 90 C2/m
	atom x y z occ Biso
	Si(1) .2834 .0859 .2939 .43
	Si(2) .2898 .1719 .8018 .46
	Mg(1) 0 .0895 .5 .53
	Cr(2) 0 .1782 0 .49 .45
	Mg(2) 0 .1782 0 .51 .45
	Mg(3) 0 0 0 .55
	Mg(4) 0 .2743 .5 .05 1.23
	Na(4) 0 .2743 .5 .95 1.23
	NaA 0 .5 0 .27 1.91
	NaA(m) .0442 .5 .0930 .27 2.13
	NaA(2) 0 .4725 0 .10 2.74
	O1 .1130 .0870 .2134 .62
	O2 .1188 .1678 .7335 .58
	F3 .1041 0 .7068 .80
	O4 .3620 .2512 .7977 .82
	O5 .3527 .1291 .0838 .74
	O6 .3445 .1191 .5844 .73
	O7 .3421 0 .2935 .78
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