Do dislocations and stacking faults increase the oxidation rate of pyrites?

XPS, SEM and TEM studies were made on coal, non-coal, and shock-loaded pyrites that had been experimentally weathered under high relative humidity. Reactivity (oxidation) of the different pyrite samples may be related to their stacking fault densities. A coal pyrite sample that had the highest stacking fault concentration was also the most reactive pyrite. No systematic relationship between reactivity and dislocation density was observed. Shock-loaded samples exposed to mean bulk shock temperatures between 175 and 475°C showed an increase in the number of reactive sites and shock-loaded samples exposed to mean bulk shock temperatures between 500 and 700°C showed decreases in the number of reactive sites.