Definition

Noun: - A common mineral (iron disulfide): A naturally occurring, brittle mineral with a metallic luster and a pale brass-yellow color. Its chemical composition is FeS₂.

Usage

• As a subject: "Iron pyrite is often mistaken for gold."
• As an object: "The geologist identified the sample as iron pyrite."
• With modifiers: "The cubic crystals of iron pyrite were well-formed."

Examples

• Miners during the gold rush were often disappointed to discover they had found iron pyrite instead of real gold.
• The museum's collection features a large, spectacular specimen of iron pyrite.
• Due to its ability to create sparks when struck against steel, iron pyrite was historically used in early firearms.

Advanced Usage

• In geology/chemistry contexts: The term is used precisely to describe the specific mineral phase of iron disulfide, distinguishing it from other sulfide minerals.
  • The ore body contained significant amounts of iron pyrite, which complicated the extraction process for other metals.

Variants and Related Words

• Pyrite (n): The more common, shortened name for iron pyrite. "The rock was studded with pyrite."
• Fool's gold (n, informal): A colloquial nickname for iron pyrite, referencing its deceptive appearance. "Many novice prospectors were tricked by fool's gold."

Synonyms

• Fool's gold (informal/nickname)
• Iron disulfide (chemical name)

Notes on Meaning

While "pyrite" can refer to a class of minerals with similar structures, the term iron pyrite specifically denotes the iron-bearing variety (FeS₂). Its most famous characteristic is its visual similarity to gold, leading to its common nickname.

Noun

1. a common mineral (iron disulfide) that has a pale yellow color