1. of, relating to, or containing pyrite or pyrites (iron sulfide minerals)
Usage: technical; mineralogy
2. resembling or having the properties of pyrite; fool's gold-like
Usage: rare

Examples

• The pyritous ore samples contained significant quantities of iron sulfide.
• Geologists identified pyritous deposits in the rock formation.
• The mineral's pyritous luster made it superficially resemble gold.
• Pyritous minerals are commonly found in coal seams.
• The pyritous composition of the sample was confirmed through X-ray analysis.