一、引言近几年来,由于矿物物理学的迅速发展,国际上对矿物的有序—无序结构、阳离子的占位次序以及元素的迁移和富集规律等课题的研究越来越深入了.因为这些问题不仅是岩石矿物学的基础理论,而且对了解有关矿产生成的地质条件(温度、压力等热力学因素)也提供了有用的依据.目前国外用晶体化学理论、晶体场论及价键理论对不少矿物阳离子的占位度作了较满 I. INTRODUCTION In recent years, due to the rapid development of mineral physics, the research on the orderly-disordered structure of minerals, the place of cations and the rules of migration and enrichment of elements has been deepened in the world. Because these questions are not only the basic theory of rock mineralogy, but also provide a useful basis for understanding the geological conditions (such as temperature, pressure and other thermodynamic factors) of mineral production.Currently, crystal chemistry theory, crystal field theory and valence bond theory Many mineral cations occupy the degree made full