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Kimberlites are complex rocks that came to the Earth's surface from great depths. The picture shows a thin section of a carbonate-​rich kimberlite. (Photograph: David Swart / Messengers of the Mantle Exhibition)

Traces of life in the Earth’s deep mantle

Minerals are visible in rock samples from the coast of Oman. Scientists said these rocks may reveal new information about subduction, an important tectonic process on Earth. Credit: Joshua Garber / Penn State.

Mineral dating reveals new clues about important tectonic process

Can diamonds originate methane?

Igánâq, Greenland: view to the southwest from the Igánâq summit (~540m) towards Tunulliarfik and the snowy peaks of Ilímaussaq. Credit: University of St Andrews

New tools to unearth rare metals

Some of the world’s oldest rubies linked to early life

Gold in pyrite

‘Fool’s gold’ not so foolish after all

Zircons studied by the research team, photographed using cathodoluminescence, a technique that allowed the team to visualize the interiors of the crystals using a specialized scanning electron microscope. Dark circles on the zircons are the cavities left by the laser that was used to analyze the age and chemistry of the zircons.Scientists led by Michael Ackerson, a research geologist at the Smithsonian's National Museum of Natural History, provide new evidence that modern plate tectonics, a defining feature of Earth and its unique ability to support life, emerged roughly 3.6 billion years ago. The study, published May 14 in the journal Geochemical Perspective Letters, uses zircons, the oldest minerals ever found on Earth, to peer back into the planet's ancient past.The team tested more than 3,500 zircons, each just a couple of human hairs wide, by blasting them with a laser and then measuring their chemical composition with a mass spectrometer. These tests revealed the age and underlying chemistry of each zircon. Of the thousands tested, about 200 were fit for study due to the ravages of the billions of years these minerals endured since their creation. Credit: Michael Ackerson, Smithsonian.

Earth’s oldest minerals date onset of plate tectonics to 3.6 billion...

McGill Colloidal Au research team study a mineralized (gold-bearing) vein underground at the Brucejack mine. Credit: Duncan McLeish

Clues from soured milk reveal how gold veins form

The research potentially has wide implications for the materials sector and industry. Credit: Monash University

Rare earth unlocks copper, gold and silver secrets

Scientists and philosopher team up, propose a new way to categorize...

Igneous zircon crystal: shows zircon had two main growth periods approx. 20 million years apart in different magmas.

Geoscientists use zircon to trace origin of Earth’s continents

Fragments of the Oued Awlitis 001 meteorites acquired by the Ludovic-Ferrière. Credit: University of Manchester

Donwilhelmsite : New mineral from the moon could explain what happens...

Chrysoberyl

Chrysoberyl : One of the world’s most expensive Gemstone

The fluid inclusions inside the olivine contain nanodiamonds, apart from serpentine, magnetite, metallic silicon and pure methane. Credit: University of Barcelona

Natural nanodiamonds in oceanic rocks

Photo of a glendonite. Credit: Bo Schultz

Volcanic eruptions may explain Denmark’s giant mystery crystals

Brazilian emeralds in a quartz-pegmatite matrix. (Photo courtesy of Madereugeneandrew/Wikimedia Commons)

Earth grows fine gems in minutes

A sample of pebbly rock that U of A researchers took from an outcrop in Nunavut. The rock was found to contain both gold and diamonds—a rare combination similar to that found in the world's richest gold deposit in South Africa. (Photo: Supplied)

Diamonds found with gold in Canada’s Far North offer clues to...

Pioneering new research has helped geologists solve a long-standing puzzle that could help pinpoint new, untapped concentrations of some the most valuable rare earth deposits. Credit: Michael Anenburg, ANU.

Geologists solve puzzle that could predict valuable rare earth element deposits

Larger: A back-scattered electron image of a microscopic crystal of priscillagrewite-(Y) enclosed in fluorapatite. Inset: An optical image of the same crystal. Credit: American Mineralogist / Irina Galuskina et al.

Priscillagrewite : New mineral named in honor of renowned Nebraska geologist

A rough diamond from Kankan, Guinea, that was analyzed in a new study led by a PhD student at the U of A. The imperfections inside the diamond are small inclusions of a mineral called ferropericlase, which is from the lower mantle. Credit: Anetta Banas

Uncovering new understanding of Earth’s carbon cycle

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