Iron pyrites powdered ore (pyrites)

Pyrite with gold or yellow copper, looks like gold, is also known as "fools gold"。
density：4.9―5.2g/cm³；　　    hardness：6-6.5；　　    Melting point：1171℃  
particle size：325Mesh；325 mesh sieve materials＜3%；
Actual weight：4.6g/ml；specific gravity：4.6g/ml；Specific volume：0.35ml/g～0.5ml/g；
Specific heat：0.12KC/kg～0.146KC/kg；PH value：＜5.5