The Mineralogical Characterstics of Molybdenite of Pingdi Molybdenite Deposit in Wuyishan

Mineralogical characterstics of molybdenite from Pingdi molybdenite deposit in Wuyishan were studied based on field systematic investigation,sampling,morphology analysis by using polarizing microscope,ore microscope and SEM,polymorph study of molybdenite by using powder diffraction,and compositional analysis of molybdenite by using electron probe.Results show that Ore types include mainly pyrite-sericite-quartz alteration rock type and structural breccia type.The main characterstics of molybdenite in pyrite-sericite-quartz alteration rock type ore are high in crystallinity,with larger particles,medium coarse-medium fine grain platy structure,and obvious polychroism.The main characteristics of molybdenite in structural breccia type ore are lower in crystallinity,with smaller particles,medium coarse-medium fine grain platy structure,and small amount of thick tabular structure(in zigzag).The types of polymorph of the two kinds of molybdenite all are 2H type,only small amount of molybdenite in structural breccia type ore is of the weak peak of 3R type.Contents of impurities of two kinds of molybdenite are lower than other kinds of molybdenite,but the contents of impurities of molybdenite of the structural breccia type ore are little higher than that of the pyrite-sericite-quartz alteration rock type ore,and the same with Re.