Biotite
	Ohta T, Takeda H, Takeuchi Y
	American Mineralogist 67 (1982) 298-310
	Mica polytypism: Similarities in the crystal structures of coexisting 1M and
	2M(1) oxybiotite
	_database_code_amcsd 0000861
	5.3204 9.210 10.104 90 100.102 90 C2/m
	atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
	Mg1 0 0 .5 .624 .0040 .0012 .0033 0 .0012 0
	Fe1 0 0 .5 .190 .0040 .0012 .0033 0 .0012 0
	Al1 0 0 .5 .186 .0040 .0012 .0033 0 .0012 0
	Mg2 0 .34538 .5 .507 .0033 .00286 .00308 0 .00073 0
	Fe2 0 .34538 .5 .289 .0033 .00286 .00308 0 .00073 0
	Ti2 0 .34538 .5 .168 .0033 .00286 .00308 0 .00073 0
	Al2 0 .34538 .5 .036 .0033 .00286 .00308 0 .00073 0
	Si .0730 .16733 .22283 .71 .0045 .00158 .00313 .00004 .00087 .00001
	Al .0730 .16733 .22283 .266 .0045 .00158 .00313 .00004 .00087 .00001
	Fe .0730 .16733 .22283 .024 .0045 .00158 .00313 .00004 .00087 .00001
	K 0 .5 0 .0167 .0053 .0075 0 .0023 0
	O1 .0177 0 .1666 .0146 .0026 .0041 0 .0006 0
	O2 .3217 .2315 .1645 .0098 .0044 .0040 -.0019 .0017 -.0005
	O3 .1298 .1697 .3905 .0049 .0015 .0031 .0001 .0011 -.0001
	O4 .1335 .5 .4006 .0057 .0022 .0030 0 .0010 0
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