fool's gold

English Thesaurus

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

hypernym	:	mineral,
definition	:	solid homogeneous inorganic substances occurring in nature having a definite chemical composition (noun.substance)

substance holonym	:	atomic number 34, se, selenium,
definition	:	a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite) (noun.substance)