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Aenigmatite |
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Gasparik T, Parise J B, Reeder R J, Young V G, Wilford W S |
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American Mineralogist 84 (1999) 257-266 |
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Composition, stability, and structure of a new member of the aenigmatite group, |
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Na2Mg4+xFe2-2xSi6+xO20, synthesized at 13-14 GPa |
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_database_code_amcsd 0002100 |
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10.328 10.724 8.805 105.15 96.85 125.47 P-1 |
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atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) |
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Mg1 0 0 .5 .689 .012 .009 .015 .008 -.003 -.001 |
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Si1 0 0 .5 .060 .012 .009 .015 .008 -.003 -.001 |
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Fe1 0 0 .5 .251 .012 .009 .015 .008 -.003 -.001 |
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Mg2 0 .5 0 .646 .010 .013 .014 .005 .004 .000 |
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Si2 0 .5 0 .056 .010 .013 .014 .005 .004 .000 |
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Fe2 0 .5 0 .298 .010 .013 .014 .005 .004 .000 |
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Mg3 .3139 .8489 .1780 .699 .012 .011 .010 .008 .005 .005 |
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Si3 .3139 .8489 .1780 .061 .012 .011 .010 .008 .005 .005 |
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Fe3 .3139 .8489 .1780 .240 .012 .011 .010 .008 .005 .005 |
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Mg4 .7687 .8191 .1508 .724 .008 .008 .007 .005 .002 .002 |
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Si4 .7687 .8191 .1508 .063 .008 .008 .007 .005 .002 .002 |
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Fe4 .7687 .8191 .1508 .213 .008 .008 .007 .005 .002 .002 |
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Mg5 .0949 .9394 .0559 .765 .009 .015 .013 .007 .006 .007 |
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Si5 .0949 .9394 .0559 .066 .009 .015 .013 .007 .006 .007 |
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Fe5 .0949 .9394 .0559 .169 .009 .015 .013 .007 .006 .007 |
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Mg6 .5959 .9422 .0646 .728 .009 .011 .007 .006 .005 .005 |
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Si6 .5959 .9422 .0646 .063 .009 .011 .007 .006 .005 .005 |
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Fe6 .5959 .9422 .0646 .209 .009 .011 .007 .006 .005 .005 |
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Mg7 .9920 .7350 .2649 .742 .007 .007 .008 .005 .000 .000 |
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Si7 .9920 .7350 .2649 .064 .007 .007 .008 .005 .000 .000 |
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Fe7 .9920 .7350 .2649 .194 .007 .007 .008 .005 .000 .000 |
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Si1 .4767 .2328 .3320 .008 .010 .004 .006 .003 .004 |
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Si2 .9836 .2339 .3451 .009 .011 .008 .007 .004 .006 |
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Si3 .7910 .3428 .2402 .007 .011 .003 .006 .003 .003 |
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Si4 .2793 .3399 .2254 .007 .008 .004 .005 .003 .003 |
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Si5 .6497 .9493 .4436 .008 .006 .008 .004 .003 .004 |
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Si6 .3549 .5602 .0458 .008 .005 .007 .004 .002 .002 |
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Na1 .2093 .6344 .3911 .013 .011 .014 .006 .001 .005 |
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Na2 .6621 .6118 .3698 .011 .014 .020 .008 .006 .010 |
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O1 .3555 .0650 .1628 .007 .009 .010 .005 .006 .007 |
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O2 .8600 .0659 .1743 .007 .011 .016 .007 .004 .007 |
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O3 .5595 .9605 .2915 .006 .012 .008 .005 .000 .004 |
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O4 .0255 .9357 .2693 .024 .030 .010 .020 .000 .003 |
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O5 .2314 .8718 .3902 .010 .004 .006 .006 .002 .001 |
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O6 .7486 .8827 .3901 .010 .005 .011 .005 .003 .004 |
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O7 .4926 .1955 .4984 .007 .013 .009 .006 .005 .005 |
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O8 .9556 .7774 .4830 .011 .014 .017 .005 -.002 .009 |
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O9 .8970 .3218 .3701 .013 .014 .012 .010 .004 .001 |
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O10 .4029 .3363 .3533 .009 .009 .007 .006 .005 .003 |
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O11 .6588 .1729 .0694 .011 .005 .005 .004 .001 -.002 |
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O12 .1538 .1675 .0617 .011 .005 .006 .003 .000 -.002 |
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O13 .5289 .7104 .0353 .013 .006 .007 .006 .004 .001 |
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O14 .0605 .7288 .0654 .006 .011 .025 .007 .001 .004 |
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O15 .2426 .6133 .1125 .008 .010 .007 .007 -.001 .000 |
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O16 .7512 .6099 .1283 .013 .007 .014 .003 .004 -.002 |
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O17 .4034 .5015 .1889 .008 .005 .009 .003 .004 .002 |
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O18 .9347 .5112 .2243 .007 .018 .011 .007 .003 .010 |
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O19 .1664 .3696 .3195 .007 .004 .013 .002 .005 .003 |
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O20 .6738 .3666 .3372 .005 .007 .005 .002 .003 .000 |
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