Pyrite, Ellis County, Texas
Pyrite, an Iron Sulfide
Locality: Ellis County, Texas (probably from the Txi Industries Cement Quarry in Midlothian)
Chemical Formula: FeS2
Crystal System: Isometric
Specimen size: 3 in x 2.75 in 2.5 in
Specimen weight: 103 grams
In the Arthur E. Smith Collection, on display at Wheaton College, Wheaton, Illinois.