My periodic table poster is now available! Pyrite. Description from the source: Pyrite (Fe S2 cub.), Huanzala`, Peru`. Nice crystal cluster. 3x2,5x2 cm; 17 g. Source: Simone Citon Contributor: John Gray Acquired: 30 September, 2008 Text Updated: 1 October, 2008 Price: Trade Size: 1.2" Composition: FeS2