A large crystal of lead sulfide from Picher, Oklahoma, has significant differences in isotopic composition of lead in successive growth zones. Lead isotope ratios in the parent ore-fluid evidently ...

Beveridge and Denbigh 1 have directed attention to the development of a concentric shell of zinc oxide when a compressed sphere of zinc sulphide powder was oxidized in air at 1,250° C. This shell was ...

The main ingredients of early cosmetics were lead sulphide and lead carbonate, the most common naturally occurring lead compounds. Lead sulphide – or ‘galena’ – is grey and relatively soft with a ...