Definition

Noun: * A brownish, bronze-yellow to brownish iron sulfide mineral (FeS) with a metallic luster. It is weakly magnetic and is an important ore of nickel when nickel substitutes for some of the iron in its crystal structure.

Usage

Pyrrhotite is a specific term used in the fields of geology, mineralogy, and mining. It refers to the mineral itself, its physical properties, or its occurrence.

Examples

• Noun:
  • The geologist identified the metallic, bronze-colored grains as pyrrhotite.
  • Pyrrhotite is often found in association with pentlandite and chalcopyrite in magmatic sulfide deposits.
  • The weak magnetism of pyrrhotite helps distinguish it from other iron sulfide minerals like pyrite.

Advanced Usage

• "Pyrrhotite weathering": Refers to the chemical breakdown of pyrrhotite, which can produce sulfuric acid and cause environmental acid mine drainage.
  • The pyrrhotite weathering in the tailings is a major environmental concern.
• "Nickeliferous pyrrhotite": Specifies pyrrhotite that contains a significant amount of nickel, making it an economic ore.
  • The mine primarily extracts nickel from nickeliferous pyrrhotite.

Variants and Related Words

• Magnetic Pyrite: An older, informal name for pyrrhotite, referencing its weak magnetic properties which pyrite ("fool's gold") lacks.
• Troilite: A non-magnetic variety of iron sulfide (FeS) with a specific, stoichiometric composition, often considered a distinct mineral from the more common, non-stoichiometric, magnetic pyrrhotite.

Synonyms

• Magnetic Pyrite (informal, contextual)

Different Meanings

The word "pyrrhotite" has only one primary meaning as a specific iron sulfide mineral. Any other usage would be highly technical and related to its crystal structure (e.g., monoclinic pyrrhotite vs. hexagonal pyrrhotite).

Noun

1. a brownish iron sulfide mineral (FeS) having weak magnetic properties