|a blackish mineral that is a type of uraninite and occurs in veins, frequently associated with silver: the principal source of uranium and radium. Formula: UO2|
|[C18: partial translation of German Pechblende, from Pech|
|pitchblende (pĭch'blěnd') Pronunciation Key
A brown to black, often crusty, cubic mineral that is a principal ore of uranium. It is highly radioactive. Chemical formula: UO2.