(mineralogy) Naturally-occurring uranium oxide, a variety of the mineraluraninite.
Examples
He was probably one of the few Canadian prospectors of that time who could have identified the pitchblende mineral.
With his dog team on his second journey in search of pitchblende he had traveled fifty miles, and the day was still young.
It is worth recalling the history of this treatment, which began when American, James Douglas, discovered extensive pitchblende deposits on his Western mining properties.
From the other camp Johnny Thompson went in search of pitchblende, only to return empty-handed.
During the early years of radium and uranium refinery operations in Port Hope, highgrade pitchblende ores were processed.
The most common ore of the element is pitchblende, although it is also present in other minerals, such as uraninite, carnotite, uranophane, and coffinite.