Morphological characteristics

Pyrrhotite is polymorphic, and experiments have shown that the occurrence of polymorphs is related to the formation temperature, with 2H-type pyrrhotite forming at a higher temperature than 3R-type pyrrhotite. From low to high temperature, amorphous → colloidal → 3Mo → 2HMo is formed, and the temperature measurement data show that the formation temperature of pyromorphite has a wide interval, which can be from quite high temperature to relatively low temperature, and a large amount of pyromorphite is formed in the stage of high to middle temperature. Under hydrothermal action, it precipitates under more acidic conditions, i.e., pyromolybdenite is most stable under acidic conditions, and when the solution turns neutral, molybdenum changes to soluble thiomolybdate and molybdate and is reactivated. At low and ambient temperatures, colloidal molybdenite is generated in strongly acidic reducing environments, and its oxidized product is blue molybdenite (-n). In exotherm, molybdenum is, with strong activity. It is similar to uranium and is stable in a transitional environment of oxidation and reduction close to neutral or alkaline, from which a variety of uranium-containing molybdate minerals are produced, such as molybdenum uraninite, molybdenum-calcium uraninite, and so on. Ferromolybdenite is a common mineral formed from sulfide ores under acidic conditions (pH=3 to 5). Colored molybdenite is the product of molybdenum-bearing lead and zinc ores under neutral conditions.

Rhenium and molybdenum have similar ionic radii, so it often displaces molybdenum and is enriched in molybdenum pyroxene, which is the main source of rhenium for industrial use. The rhenium content in pyromolybdenite is often related to the 3R-type content of pyromolybdenite and the rhenium content of the mineralizing solution.