Answer:

pyrite

Answer	Crossword Clue
PYRITE	Fool's gold
PYRITE	Iron ...
PYRITE	Fool's gold.

PYRITE	Iron sulfide.
PYRITE	Sulfur source
PYRITE	Source of sulfuric acid
PYRITE	It glitters but isn't gold
PYRITE	Mineral resembling gold
PYRITE	Glitterer that is not gold

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.