Definition

1. Noun:
   • A mineral consisting of uranium oxide: Pitchblende is a dense, black, radioactive mineral primarily composed of uranium oxide (UO₂). It contains trace amounts of other elements like radium, thorium, polonium, lead, and helium.
   • The chief uranium ore: In its massive, non-crystalline form, the mineral uraninite is specifically called pitchblende. It is the most important source of uranium.

Usage Examples

• Noun:
  • The discovery of pitchblende in this region led to a mining boom.
  • Marie and Pierre Curie isolated radium from tons of pitchblende ore.

Advanced Usage

• Scientific Context: The term is used almost exclusively in geological, mining, and historical scientific contexts to refer to the specific, massive form of uraninite ore.
  • Early studies of radioactivity relied heavily on samples of pitchblende.

Variants and Related Words

• Uraninite (n): The mineralogical name for uranium oxide (UO₂). "Pitchblende" refers specifically to the massive, often botryoidal or granular, variety of uraninite.
  • While all pitchblende is uraninite, not all uraninite specimens are classified as pitchblende.

Synonyms

• Uraninite (when referring to the massive, ore-grade form).

Notes on Meaning

• The word "pitchblende" originates from German (: "Pech" meaning pitch, due to its black, glossy appearance, and "Blende" meaning a deceiving mineral, as it contained valuable uranium but did not yield common metals). It is a historical and industrial term crucial to the history of nuclear physics and chemistry.

Noun

1. a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore