Bizarre Hexagonal Diamonds Got here From an Asteroid-Dwarf Planet Smashup


A massive, 50,000-year-old meteorite crater as seen from the air.

Meteor Crater in Arizona. Meteorite fragments from the influence comprise lonsdaleite.
Photograph: DANIEL SLIM/AFP (Getty Photographs)

New analysis signifies {that a} uncommon type of diamond might originate within the burbling cores of distant worlds, arriving on Earth due to violent cosmic collisions.

In keeping with a staff of scientists in Australia, the mineral lonsdaleite—a sort of diamond with a hexagonal crystal construction—will be present in meteorites that had been seemingly created when an asteroid collided with a dwarf planet billions of years in the past. They investigated 18 ureilite fragments utilizing superior electron microscopy, to higher perceive how the lonsdaleite inside the area rocks shaped. Their analysis is revealed in the present day in PNAS.

“This research proves categorically that lonsdaleite exists in nature,” mentioned research co-author Dougal McCulloch, director of the Microscopy and Microanalysis Facility at RMIT in Australia, in a college launch.

Lonsdaleite has beforehand been present in meteorites, together with the Diablo Canyon meteorite, a fraction present in Arizona’s well-known Meteor Crater. The mineral has additionally been created in lab settings, however in any other case is vanishingly uncommon on Earth. The mineral differs from ordinary diamonds in its crystal construction, which is hexagonal (atypical diamonds have a cubic crystal construction.) Separate analysis earlier this yr indicated that lonsdaleite’s construction makes it more durable than different diamonds.

A mottled grey-brown space rock.

Of their current analysis, the staff discovered that lonsdaleite happens naturally in ureilite meteorites, a sort of carbon-bearing area rock made up of silicates, sulfides, and steel. They assume the lately studied ureilite rocks shaped in a the mantle of an historical dwarf planet, which collided with an asteroid early within the formation of the photo voltaic system. The hexagonal lonsdaleite diamonds shaped inside the ureilite rocks.

Excessive physics tends to carry out unusual mineral constructions. In 1945, the Trinity bomb take a look at confirmed the effectiveness of the newly developed hydrogen bomb and additionally created trinitite, a weird, glasslike quasicrystal shaped from desert sand and copper wiring within the high-pressure, high-temperature surroundings of the explosion.

An asteroid’s collision with a dwarf planet is a equally excessive occasion, one with the excessive temperatures and pressures essential to create diamonds. Lonsdaleite has additionally been discovered within the meteorite fragments left over from the Meteor Crater influence occasion, which occurred about 50,000 years in the past.

The current work gives “sturdy proof that there’s a newly found formation course of for the lonsdaleite and common diamond,” McCulloch added. By the staff’s reckoning, the lonsdaleite shaped within the historical dwarf planet “shortly after a catastrophic collision.”

If lonsdaleite’s construction makes it more durable than atypical diamonds, it might have purposes within the supplies sciences.

“Nature has thus supplied us with a course of to attempt to replicate in trade,” mentioned research co-author Andy Tomkins, a geologist at Monash College, within the launch. “We expect that lonsdaleite might be used to make tiny, ultra-hard machine components if we are able to develop an industrial course of that promotes alternative of pre-shaped graphite components by lonsdaleite.”

Actually, making these diamonds in a lab can be a extra environment friendly methodology than ready for the remnants of one other cosmic collision to reach on Earth.

Extra: Bizarre New Quantum Diamonds Provide Hope for a Quantum Web



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