Giuseppetti G, Mazzi F, Tadini C
Neues Jahrbuch fur Mineralogie, Monatshefte 1988 (1988) 203-221
The crystal structure of synthetic burkeite Na4SO4(CO3)t(SO4)1-t
Sample A
Note sign of y-coordinate for O3 and O5 altered to reproduce reported bond lengths
Locality: synthetic
5.170 9.217 7.058 90 90 90 Pmnm
atom x y z occ Biso
Na1 .25 .7509 .0051 2.24
Na2 .25 .4254 .25 5.46
Na3 .75 .8754 .25 2.19
CT1 .75 .5584 .25 .61 1.61
ST1 .75 .5584 .25 .39 1.61
ST2 .2951 .0913 .25 .5 1.16
O1 .75 .4226 .25 .85 3.8
O2 .5357 .6403 .25 .88 2.9
O3 .75 -.4693 .0819 .15 5.5
O4 .9307 .5809 .0951 .12 6.0
O5 .1927 -.1645 .0815 .5 2.5
O6 .2164 -.0632 .25 .5 1.5
O7 .5798 .1057 .25 .5 2.2
The crystal structure of synthetic burkeite
Sample B
5.177 9.224 7.066 90 90 90 Pmnm
Na1 .25 .7510 .0054 2.38
Na2 .25 .4257 .25 5.70
Na3 .75 .8788 .25 2.29
C .75 .5590 .25 .55 1.65
S1 .75 .5590 .25 .45 1.65
S2 .2939 .0908 .25 .5 1.25
O1 .75 .4219 .25 .83 4.3
O2 .5355 .6427 .25 .86 3.0
O3 .75 -.4700 .0784 .17 5.3
O4 .9281 .5783 .0941 .14 5.2
O5 .1896 -.1632 .0813 .5 2.5
O6 .2156 -.0641 .25 .5 1.6
O7 .5757 .1061 .25 .5 2.4
Sample C
5.198 9.255 7.085 90 90 90 Pmnm
Na1 .25 .7512 .0047 2.39
Na2 .25 .4250 .25 5.79
Na3 .75 .8805 .25 2.45
C .75 .5606 .25 .49 1.84
S1 .75 .5606 .25 .51 1.84
S2 .2942 .0896 .25 .5 1.30
O1 .75 .4216 .25 .83 4.2
O2 .5358 .6429 .25 .83 2.7
O3 .75 -.4701 .0854 .17 5.9
O4 .9310 .5834 .0888 .17 4.5
O5 .1892 -.1606 .0816 .5 2.9
O6 .2177 -.0651 .25 .5 1.7
O7 .5755 .1071 .25 .5 2.3
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