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