THE source from which radium is obtained is the mineral pitchblende. This mineral occurs in veins, like the majority of useful metals; I may refer particularly to the mineral veins of Cornwall ...

oi' radium destroy the validity of the older thermal arguments, but also it led directly to the elaboration of a new and more refined method. Every radio-active mineral may be regarded as a self ...

Radium was isolated while the Curies were studying the mineral pitchblende, revealing the element’s unique radioactive properties. • Their work not only earned them international acclaim ...