OLIVIN FROM KIMBERLITE UNDER ELECTRONIC MICROSCOPE
Chemical composition of olivine from Yakutian kimberlite is studied with application of electron microscopy methods (22 microprobe analyses are executed). Three varieties of olivine are distinguished: primary, weakly changed, and completely substituted. The first variety has got very high forsterite percentage (94-96%). The small rim with high Fe percentage is typical for the second one. The third variety is presented by aggregates of magnetite, carbonates, Fe-olivine, etc. There are carbonaceous compounds in its composition, too.