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Barstowite: Pb4(CO3)Cl6·(H2O)
Comments: SEM images of irregular prismatic barstowite with phosgenite. (MinMag, v55:378). Location: Lead-antimony vein at the southwestern end of Bounds Cliff, St Endellion, Cornwall, UK. Scale: Scale bar left 400 µm right 100 µm. © Mineralogical Magazine