\tBrowse the article Marcasite\tMarcasite
Marcasite, or White Iron Pyrites,a crystalline form of common iron pyrites, but with a lower specific gravity. Marcasite has a pale yellow to whitish metallic luster. It is often used for costume jewelry.
Formula: FeS2. Specific gravity: 4.9. Hardness: 6-6.5.