AM_Barstowite Formula: Pb4 Cl6 C O4 H2 Name: Barstowite Unit cell: 4.2023 9.202 16.6608 90.0 91.829 90.0 , V=643.94 Space group: P121/M1 (11)

Steele I M , Pluth J J , Stanley C J , Mineralogical Magazine , 63 (1999) p.901-907, Crystal structure of barstowite (3PbCl2PbCO3H2O), Locality: Bounds Cliff, St Endellion, Cornwall