uraninite

Thân thiện

A geologist examines a sample of uraninite in the laboratory.

Definition

1. Noun:
   • A mineral: A naturally occurring, inorganic solid substance with a specific chemical composition and crystalline structure.
   • Composition: It consists primarily of uranium oxide (UO₂), with trace amounts of other elements including radium, thorium, polonium, lead, and helium.
   • Ore form: When found in massive, non-crystalline forms, it is specifically called pitchblende, which is the primary ore for uranium.

Usage Examples

• Noun:
  • The geologist identified the black, dense mineral as uraninite.
  • Uraninite is a major source of uranium for nuclear fuel.
  • The discovery of pitchblende, a type of uraninite, was crucial to the early study of radioactivity.

Advanced Usage

• Scientific Context: In geology and mining, "uraninite" is the formal mineralogical name, while "pitchblende" is used for its massive, often botryoidal (grape-like) aggregate form that is mined.
  • The sample's crystalline structure confirmed it was uraninite, not the more amorphous pitchblende.

Variants and Related Words

• Pitchblende (noun): A massive, often impure variety of uraninite. It is not a separate mineral but a specific form of uraninite that is the chief uranium ore.
  • Marie and Pierre Curie worked with pitchblende to isolate radium.
• Uranium oxide (noun phrase): The primary chemical compound (UO₂) that constitutes uraninite.

Synonyms

• Pitchblende: (when referring to the massive, ore-grade form).
• Uranium ore: (a functional synonym in the context of mining and resource extraction).

Notes on Meaning

• The core meaning of "uraninite" is as a specific mineral species. Its significance stems from being the most important ore for uranium and from its historical role as the source material for the discovery of radioactive elements like radium and polonium.
• It is distinct from other uranium-bearing minerals like carnotite or torbernite, which have different chemical compositions and crystal structures.

Học thuật

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

Từ đồng nghĩa

• pitchblende