Mineralogy of Manganese Oxide Minerals in Iron- Manganese Nodules of Several Main Soils in China

摘要

X-ray diffraction and selective chemical dissolution methods were used to investigate the composition of Mn oxide minerals in Fe-Mn nodules of several main types of soils in China. The changes of relative intensity Of X-ray diffraction patterns were studied both before and after chemically selective dissolution. It was found That lithiophorite was a common Mn oxide in all examined Fe-Mn nodules. Todorokite, however, was a Predominant Mn oxide in Fe-Mn nodules in cal-aquic Vertisols of Linyi, Shandong Province.