S 48%min Fe 43%min Dear Sir or Madam,We are one of the biggest pyrite products manufacturer in China.Our main products are high quality pyrite/ferro sulphur /FeS2 lumps and its powder.The quality and the size as follows:Pyrite lumps(FeS2):Quality :S               48%min;Fe              43%min;SiO2             3%max;H2O              1%max.Size:3-15mm;10-30mm;10-50mm;10-80mm. Pyrite powder(FeS2):Quality :S               48%min;Fe              43%min;SiO2             3%max;H2O              1%max.Size:100mesh ;200mesh;325mesh 95%min down;400mesh90% min down