Barstowite
Kutzke H, Klapper H, Merlino S, Pasero M, Perchiazzi N, Eggert G
Zeitschrift fur Kristallographie 215 (2000) 110-113
The crystal structure of barstowite, Pb4Cl6(CO3)*H2O, determined on
crystals from Etruscan slags and from a Late-Hellenistic shipwreck
Locality: a Late-Hellenistic shipwreck found near Mahdia, Tunisia
_database_code_amcsd 0019157
4.2043 9.199 16.663 90 91.82 90 P2_1/m
atom     x      y      z Biso
Pb1  .2395    .25 .45859 2.25
Pb2  .2456    .25 .98843 2.40
Pb3  .6904 .00959 .23182 1.59
Cl1   .212    .25  .2812  1.3
Cl2   .757    .25  .1040  1.2
Cl3  .2602  .9491  .0861  1.6
Cl4  .7319  .0310  .4120  1.4
C    .9100    .25   .745  1.0
O1    .175    .25  .7862  1.2
O2    .794   .127  .7228  1.2
Wat3  .749    .25  .5672  1.8