Earth's most abundant mineral finally has a name | Science News

ADVERTISEMENT

MISSION CRITICAL

Support credible science journalism.

Subscribe to Science News today.


Introducing

Earth's most abundant mineral finally has a name

Bridgmanite, long sought, now found in 1879 meteorite

By
2:00pm, November 27, 2014
A meteorite sample

MINERAL MONIKER  Part of this sample of a meteorite that crashed into Australia 135 years ago contains the newly christened mineral bridgmanite. The mineral makes up 38 percent of Earth’s volume.

Sponsor Message

A space rock has helped scientists characterize, and finally name, the planet’s most common mineral.

The newly christened bridgmanite, named for high-pressure physicist Percy Bridgman, is a high-density form of magnesium iron silicate and makes up about 38 percent of Earth’s volume. Scientists need a natural sample of a mineral before it can be officially named. However, Earth’s bridgmanite is entombed 660 to 2,900 kilometers below the surface, and doesn’t survive the trip up. For half a century scientists have fruitlessly hunted for traces of bridgmanite forged during powerful meteorite impacts that mimic the high temperatures and pressures deep inside Earth.

In the Nov. 28 Science, mineralogist Oliver Tschauner of the University of Nevada, Las Vegas and colleagues describe bridgmanite found inside a meteorite that slammed into a remote part of Queensland, Australia in 1879. The researchers estimate that the impact generated temperatures of around 2,000° Celsius and pressures greater than but akin to an adult blue whale’s mass crushing each square centimeter of rock.

The newfound bridgmanite will help scientists better understand the churning of Earth’s mantle, the team says.

Citations

O. Tschauner et al. Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite. Science. Vol. 346, November 28, 2014, p. 1100. doi: 10.1126/science.1259369.

Further Reading

N. Lubick. Tiny minerals may have shaped Earth's first plate boundaries. Science News. Vol. 185, May 17, 2014, p. 14.

A. Witze. Mystery meteorite. Science News. Vol. 183, June 29, 2013, p. 20.

S. Perkins. Under Pressure. Science News. Vol. 168, July 23, 2005, p. 52.

Get Science News headlines by e-mail.

More from Science News

From the Nature Index Paid Content