Domain Structure in Calcium-0Cerium Fluorocarbonate Minerals, Mianning County, Sichuan Province, China

摘要

The domain structures in calcium-cerium fluorocarbonate mineral series from a rare earth mineral deposit within an origin alkai granite massif in Mianning County, Sichuan Province, China, were studied by means of transmission electron microscopy. may categories of domain structures is this mineral series were observed and investigated, including the mcirotwin domains of parisite-6R_2 and B_2S-6R, the antiphase domains of B_2S-2H. The results show that the antiphase domains which are faults along crystal plane (0001) are formed by the displacement of crystal lattice in C~* direction and the displacement is 0.471 nm, A new polytype (B_4S_2-3R) of regular mixed-layer structure with B_4S_2 type is found in the domain region of mixed-linear structure.