Definition of pyrite:
(n) :
a common
mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulfide; solid state chemistry: any metal dichalcogenide that is isostructural to 1)
"copper diselenide can occur both as a marcassite and a pyrite."
Definition of pyrite:
(n) :
a common
mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulfide; solid state chemistry: any metal dichalcogenide that is isostructural to 1)
"copper diselenide can occur both as a marcassite and a pyrite."