1. AMCSD, 2013. American Mineralogist crystal structure database by Downs et al. (1993) via http://www.minsocam.org/MSA/Crystal_Database.html, and http://rruff.geo.arizona.edu/AMS/amcsd.php.
2. Color Encyclopaedia of Gemstones;Arem,1987
3. Index (inorganic) to the powder diffraction file;ASTM,1963
4. Pyrite overgrowths of marcasite from Sparta, Randolph County, Illinois;Chamberlain;Rocks Miner.,1987
5. Tabular octahedral pyrite crystals from Coulterville, Randolph County, Illinois;Chamberlain;Rocks Miner.,1989