Panunzite
Merlino S, Franco E, Mattia C A, Pasero M, De Gennaro M
Neues Jahrbuch fur Mineralogie, Monatshefte 1985 (1985) 322-328
The crystal structure of panunzite (natural tetrakalsilite)
Locality: Somma-Vesuvius area, Italy
Note: x(O7) and y(O11) adjusted to match reported bond lengths
_database_code_amcsd 0014796
20.4960 20.4960 8.549 90 90 120 P6_3
atom      x     y     z occ Biso
Na   -.0196 .2578 .7377     1.19
K1    .5028 .2698 .2405 .88 1.21
Na1   .5028 .2698 .2405 .12 1.21
K2   -.0041 .4759 .2395 .78  .98
Na2  -.0041 .4759 .2395 .22  .98
K3    .2388 .4965 .2453     1.36
K4    .2423 .0286 .2451 .83 1.62
Na4   .2423 .0286 .2451 .17 1.62
K5        0     0   .75     1.56
Al1   .0376 .1598 .5666      .66
Al2   .3282 .1903 .5593      .59
Al3   .3041 .4052 .5583      .55
Al4   .5899 .4272 .5567      .69
Al5   .0673 .4212 .5569      .58
Al6     1/3   2/3 .5541      .42
Si1   .1593 .1223 .4318      .56
Si2   .1380 .3281 .4394      .69
Si3   .4046 .1015 .4380      .77
Si4   .1629 .5892 .4427      .56
Si5   .4208 .3529 .4359      .75
Si6     2/3   1/3 .4475      .55
O1    .1436 .1403 .2534      .75
O2    .1198 .3173 .2532     1.59
O3    .4013 .1187 .2518     1.82
O4    .1510 .5755 .2528     1.77
O5    .4004 .3518 .2548     1.65
O6      2/3   1/3 .2530     1.57
O7    .1403 .4048 .4956      .27
O8    .1082 .1352 .5542     1.06
O9    .3432 .1140 .5284     1.04
O10   .4067 .2715 .4830     1.73
O11  -.0140 .3660 .4458      .95
O12   .4892 .1572 .4930      .46
O13   .1385 .0328 .4365     1.93
O14   .3355 .4962 .4771     1.82
O15   .3710 .3787 .5364     2.04
O16   .2439 .6030 .4841     1.98
O17   .0957 .5125 .5138      .51
O18   .2501 .1814 .4557     2.20
O19   .5104 .4161 .4465     1.21
O20   .5998 .3495 .5035      .59
O21   .0735 .2545 .5236      .61
O22   .2226 .3385 .4578     1.12