Tweddillite
	Armbruster T, Gnos E, Dixon R, Gutzmer J, Hejny C, Dobelin N, Medenbach O
	Mineralogical Magazine 66 (2002) 137-150
	Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals
	from the Kalahari manganese fields, South Africa
	Locality: Kalahari manganese fields, South Africa
	_database_code_amcsd 0014561
	8.934 5.718 10.325 90 114.54 90 P2_1/m
	atom x y z occ Biso
	CaA1 .7646 .75 .1575 .92
	SrA2 .5941 .75 .42163 1.03
	AlM1 0 0 0 .43 .64
	Mn3+M1 0 0 0 .48 .64
	Fe3+M1 0 0 0 .09 .64
	AlM2 0 0 .5 .66
	Mn3+M3 .2954 .25 .2181 5/6 .90
	Fe3+M3 .2954 .25 .2181 1/6 .90
	Si1 .3417 .75 .0411 .95
	Si2 .6877 .25 .2787 .85
	Si3 .1803 .75 .3150 .86
	O1 .2389 .9915 .0386 1.42
	O2 .2984 .9786 .3480 1.14
	O3 .7967 .0160 .3433 1.17
	O4 .0600 .25 .1312 .9
	O5 .0369 .75 .1479 1.0
	O6 .0661 .75 .4061 1.0
	O7 .5174 .75 .1691 1.4
	O8 .5277 .25 .3110 1.0
	O9 .6323 .25 .1063 1.8
	O10 .0815 .25 .4293 .9
	H10 .06 .25 .339 3.95
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