It specified that the jewel was found in the rocks of the Udachnaya kimberlite pipe, which is one of the largest diamond deposits in Russia. Samples of rocks and minerals of the lithospheric mantle brought to the Earth’s surface in this region have been of interest to Russian and foreign scientists since the late 1960s, as reported by ria.ru.
For more than half a century, geologists have been collecting and studying diamonds that were brought from depths of up to 250km millions of years ago. In one of these collections, a sample unique in age and education was found, an article about which was published in the authoritative journal Minerals.
Kimberlites are the most common rocks that carry diamonds from the depths of the lithospheric mantle to the earth’s surface. The diamond crystal in question grew out of a silicate or sulfide to melt. It was brought to the surface from refractory rocks that form the lithospheric mantle, included in a one-and-a-half-centimeter grain of the olivine mineral. The size of the diamond itself is only about 0.3 millimeters.
Scientists also managed to show that the conditions for the formation of diamonds in that era differed significantly from the characteristics of the later processes of formation of the bulk of currently mined crystals. Both the environment and the range of temperatures and pressures changed they claimed, and, accordingly, the depths of formation of later diamonds in a more powerful and cooled lithosphere.
According to euroweeklynews