Answer:

pyrites

Answer	Crossword Clue
PYRITES	Natural metallic sulfide minerals
PYRITES	Fool's gold.
PYRITES	Minerals of a type, sir

PYRITES	Fool's gold, e.g.
PYRITES	Brass-yellow minerals
PYRITES	Sulfide-containing group
PYRITES	Minerals that look like gold
PYRITES	Minerals known as "fool's gold"