Definition

Noun: 1. A mineral compound: A chemical compound consisting of iron (Fe) and sulfur (S) in a 1:2 atomic ratio, with the formula FeS₂. It is most commonly found in nature as the mineral pyrite.

Usage

The term "iron disulfide" is used primarily in scientific, geological, and industrial contexts to refer to the specific compound FeS₂. * Pyrite, often called fool's gold, is the most common form of iron disulfide. * Iron disulfide can be used in some types of batteries.

Advanced Usage

• Crystalline Forms: The term specifies the chemical composition but not the crystal structure. The two main natural crystalline forms are pyrite (cubic) and marcasite (orthorhombic), both of which are iron disulfide.
  • Marcasite jewelry is actually made from polished iron disulfide in its pyrite form.

Variants and Related Words

• Pyrite (n): The most common and stable natural mineral form of iron disulfide (FeS₂), known for its metallic luster and pale brass-yellow color.
• Marcasite (n): An orthorhombic mineral form of iron disulfide (FeS₂), less stable than pyrite.
• Fool's Gold (n): A common nickname for pyrite due to its resemblance to gold.

Synonyms

• Ferrous disulfide: A less common systematic name.
• Iron(II) disulfide: A formal chemical name indicating the iron is in the +2 oxidation state.

Notes on Meaning

The term "iron disulfide" refers strictly to the chemical compound FeS₂. It should not be confused with other iron sulfides like iron(II) sulfide (FeS) or iron(III) sulfide (Fe₂S₃). Its most notable characteristic is its occurrence as the mineral pyrite.

Noun

1. a compound containing two atoms of sulfur combined with iron