Barstowite
Template:Infobox mineral Barstowite, formula Pb4[Cl6|CO3]•H2O , is a transparent to white mineral in the monoclinic system.[1] It has a Mohs hardness of 3, a white streak and an adamantine lustre.[1]
The type locality for Barstowite is Bounds Cliff, St Endellion, Cornwall in the United Kingdom.[1] It is named after Richard W. Barstow[1] a Cornish mineral collector.[2]