New findings from mineral inclusions in deep-Earth diamonds add never-before-seen species and sharpen ideas about how Earth’s interior mixes.
A tiny mineral trapped inside a diamond is turning into a window on Earth’s deep interior, offering evidence that our planet’s layers are more tightly connected than previously thought.
Researchers studying deep-Earth diamonds report an expanding catalog of minerals that formed hundreds of kilometers below the surface.. In most cases, materials produced at those depths do not survive the long journey upward.. But when a fragment is locked inside a diamond. it can preserve its crystal structure. allowing scientists to examine it as a geological “time capsule.”
The breakthrough is less about the diamonds themselves and more about the tools now used to interrogate them.. Powerful new lasers and X-rays are enabling geologists to probe increasingly small flecks of trapped minerals.. With those capabilities. scientists can detect subtle chemical differences between inclusions and use the information to reconstruct how rocks evolve under extreme heat and pressure deep within the mantle.
The report points to what one researcher described as an “explosion” of new mineral discoveries from Earth’s mantle. the slowly creeping layer of rock between the crust and the core.. Among the minerals identified in recent years are breyite, grahampearsonite, and goldschmidtite.. Each addition matters because it helps refine the broader picture of how rocks transform internally. which in turn influences estimates of how much of certain elements—such as carbon and hydrogen—may be stored in Earth’s interior.
In the latest work. the findings include two minerals newly identified from trapped deep diamonds and named as new minerals by the International Mineralogical Association. with one designation not yet officially announced.. One of them, called bernwoodite, was discovered by AMNH researcher Nester Korolev and his adviser, Kate Kiseeva, along with colleagues.. It was observed in a diamond microscope sample after Korolev examined a tiny inclusion that had never been seen in nature before.
The chemistry of trapped flecks is also being read as a clue to Earth’s circulation.. According to Kiseeva. subtle chemical differences in these mineral inclusions provide direct evidence for a relatively efficient cycle that moves material from the surface down into the depths and then returns it back to the surface.. In her view. this kind of cycling helps produce a wider variety of mineral structures in the mantle than would occur if Earth’s layers remained largely unmixed.
One of the newly described minerals. kopylovite. was found in a rare American diamond recovered from a now-defunct mine in Wyoming.. The mineral is thought to form in the upper mantle between a few dozen and 200 kilometers beneath the surface.. Because kopylovite contains titanium and potassium—elements associated with rocks in Earth’s crust—the researchers propose that it may form when sediments sink into the mantle in subduction zones above slabs of oceanic crust.
Subduction slabs themselves have been observed by seismologists reaching deep toward the edge of the core. but how far sediments travel remained uncertain.. The team argues that a sufficient supply of sediments is likely needed to produce kopylovite. implying that at least some sediments may survive long enough to descend to the depth where the mineral forms.
The naming of kopylovite adds a separate thread to the story.. The report notes that it is among a small fraction of known minerals—around 3%—named after women.. In this case, the mineral honors Maya G.. Kopylova. a geoscientist at the University of British Columbia. as well as her father. Vladimir Kopylov. described as a Russian physicist. poet. and political dissident.
Bernwoodite, named in honor of British geoscientist Bernie Wood, comes from deeper in the mantle. It was found in a diamond from Brazil. The researchers suggest it forms when another recently discovered mineral from the lower mantle—davemaoite—breaks down as it rises into the transition zone.
That transition zone. described in the report as occurring roughly between 410 and 660 kilometers depth. is where minerals experience sudden changes in physical properties as atoms rearrange under immense pressure.. For bernwoodite. the presence of aluminum in its chemical structure also points toward involvement of subducted crustal material. even if that material ultimately originates from very deep levels.
Taken together. the new mineral findings strengthen a theme: the mantle may contain more mineral variety than scientists previously believed. with many species potentially overlooked because they are hard to detect in samples from the surface.. Oliver Tschauner. a mineralogist at the University of Nevada. Las Vegas. who was not part of the study. is cited saying the minerals were likely missed rather than absent.
The team is now working to verify additional candidate minerals using deep diamonds already held by the museum.. Kiseeva says the search is ongoing. reflecting a broader shift in how Earth scientists are using diamonds—as much as microscopes and high-energy probes—to discover minerals that would otherwise remain inaccessible.
Beyond the excitement of naming new species, the results carry an implication that reaches into planetary science and geochemistry.. If materials from the surface can indeed be transported efficiently into the mantle and later reintroduced. then the chemical fingerprint of Earth’s exterior could influence mineral formation at depth more directly than standard models have assumed.. Over time. that would mean that understanding Earth’s mineral inventory is not just about mapping where minerals are. but also about tracking the routes—downward and upward—that allow the planet’s materials to evolve.
deep Earth diamonds mantle minerals mineral inclusions lasers and X-rays subduction recycling mineral discoveries