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自然界辉钼矿有六方晶系二层型的2 H以及三方晶系三层型的3 R两种多型,此外,还常见2 H+3 R混合型。X射线衍射分析结果,辉钼矿有2 H+3 R型以及2 H型(图1)。这两种辉钼矿的晶体结构有很大不同(表1),而且2 H型与2 H+3 R型辉钼矿形成于不同的成矿阶段。前者形成于第一成矿阶段,而后者形成于第二成矿阶段它们的形成温度也有差别,2 H型的形成温度约为500而2 H+3 R型的形成温度为280摄氏度。这与实验研究结果:3 R型辉钼矿的形成温度一般低于350摄氏度,而2 H型的辉钼矿形成的温度比较高,多在600摄氏度以上是相吻合的。
In nature, molybdenite has hexagonal two-layer 2 H and three-layer three-layer 3 R two polytypes. In addition, 2 H + 3 R hybrid is common. As a result of X-ray diffraction analysis, the molybdenite has 2 H + 3 R type and 2 H type (FIG. 1). The crystal structures of the two molybdenites are quite different (Table 1), and the 2 H and 2 H + 3 R molybdenites are formed at different stages of mineralization. The former is formed in the first metallogenic stage, while the latter is formed at the second metallogenic stage. The formation temperature is also about 500. The formation temperature of 2 H type is about 500 and the formation temperature of 2 H + 3 R type is 280 degrees Celsius. The experimental results show that the formation temperature of R type molybdenite is generally lower than 350 degrees Celsius, whereas the formation temperature of molybdenite type 2 H is relatively high, more than 600 degrees Celsius.