The gem acted like a capsule, returning a sample from the planet's mantle.
Aaron Celestian, Los Angeles County Natural History MuseumMiners digging for diamonds in the 1980s in Botswana’s Orapa mine, one of the biggest diamond mines by area, found what was to them a disappointing discovery: A greenish octahedral-shaped diamond marred with little black specks trapped inside.
“The chances, we thought, of finding it were so low that we never really actively looked for it,” Tschauner told. So “having the real minerals from the lower mantle still present is a fairly new direction for this type of research.”
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