Abstract
Cuttings of garnet peridotite were collected between 603.2 and 683.5 in in the CCSD at Donghai. Minerals were separated by various methods and handpicked under a binocular microscope. The selected minerals were identified by SEM-EDS, microprobe, Laser Raman, and EDXD ( Synchrontron X-ray Diffraction). A number of unusual minerals have been recognized from the cuttings, e. g., moissanite, w stite, native Fe, native Cr, native Ni, native An, native Cu, native Al, taenite, kamacite, Ni-Fe-Cr alloy, Ni-Fe alloy, Fe-Cr alloy, Si-Fe alloy (Fe3Sgamma), and Co-Ni alloy. Two grains of Fe2P alloy (barringerite), have also been found. They are spheroidal in shape, with diameters of about 200 mu m, and they have identical hexagonal structures with cell parameters of a = 5.877 angstrom, c = 3.437 angstrom, and a: c = 1 :0.5848. They belong to space group P62m. This mineral, which is similar in structure and composition to artificial Fe2P (ICDD 83-2337), has previously only been found in meteorites. This is the first reported natural terrestrial occurrence of barringerite. Further study on its genesis and formational conditions is underway.