| Barstowite | |
| Category: | Halide minerals |
| Formula: | Pb4[Cl<sub>6</sub>|CO<sub>3</sub>]•H2O|IMAsymbol=Bsw[1] | molweight = | strunz = 3.DC.95| system = Monoclinic| class = Prismatic (2/m) (same H-M symbol)| symmetry = P21/m| color = White to transparent| habit = | twinning = | cleavage = | fracture = | tenacity =| mohs = 3| luster = Adamantine| polish = | refractive = | opticalprop = | birefringence = | dispersion = | pleochroism = | fluorescence= | absorption =| streak = White| gravity = | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = | references =}}Barstowite, formula Pb4[Cl<sub>6</sub>|CO<sub>3</sub>]•H2O, is a transparent to white mineral in the monoclinic system.[2] It has a Mohs hardness of 3, a white streak and an adamantine lustre. The type locality for Barstowite is Bounds Cliff, St Endellion, Cornwall in the United Kingdom. It is named after Richard W. Barstow (1947–1982), a Cornish mineral collector.[3] References} |