: High-end collectors pay premiums for rare formations, such as the perfect cubes from Navajún, Spain, or the "pyrite suns" found in coal mines.
Historically dismissed as "Fool's Gold," pyrite ( FeS2cap F e cap S sub 2 who buys pyrite
: Used as a precursor for phosphate fertilizers, detergents, dyes, and explosives. : High-end collectors pay premiums for rare formations,