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A sapphire from sediment in the Kyll, a river in the western Eifel. The crystal measures approximately 0.9 mm in diameter. | © Sebastian Schmidt

A blue miracle: How sapphires formed in volcanoes

JPL / NASA

Laser tests reveal new insights into key mineral for super-Earths

Take a close look at these seabed minerals! Green copper minerals are seen here precipitated in a sectioned sulphide sample, retrieved from a scientific cruise conducted by the Norwegian Offshore Directorate across the Mohns Ridge in 2020. Credit: Øystein Leiknes Nag/Norwegian Offshore Directorate

Artificial geysers can compensate for our mineral shortages

Representative image

Top 10 Rare Earth Minerals in 2023

Labradorite

Captivating Beauty: Exploring 6 Types of Iridescent Gemstones

Ca-silicate inclusion inside a diamond from Kankan, Guinea. Photo credit: Margo Regier.

Superdeep diamonds provide a window on supercontinent growth

Diamond

Ancient diamonds shine light on the evolution of Earth

Coloured diamonds from the Argyle diamond mine. Image: Murray Rayner, Rio Tinto

Crucial third clue to finding new diamond deposits

Tiny mineral inclusions picture for the first time oxygen accumulated in the atmosphere and changed the composition of the mantle. Credit: Hugo Moreira / Nature Geoscience

New research reveals Earth’s ancient ‘breath’

Spectacular rainbow obsidian blade

The World’s Rarest and Most Expensive Types of Obsidian

Rare Gems and Minerals in New Mexico

+30 Rare Gems and Minerals in New Mexico

Venetia Diamond Mine, South Africa. Photo by Dr Tom Gernon, University of Southampton

Scientists crack the code of what causes diamonds to erupt

Dimitri Laurent explores a typical gallery in the Nébélé Cave, which was formed by sulfuric acid speleogenesis. You can see a deep notch that indicates the former presence of a river, and sodium sulfate on the left that is produced from weathering by sulfuric acid. Credit: Christophe Durlet

Unearthing the sources of cave-forming sulfuric acid

The extensive accumulations of obsidian artefacts in level C. a,b, General view of the level and detail of artefact density along the MS cliff (a) and inset (b). c,d, General view (c) and detail (d) of the artefact concentration (mainly handaxes) in the test pit of 2004. Credit: Nature Ecology & Evolution (2023). DOI: 10.1038/s41559-022-01970-1

Obsidian handaxe-making workshop from 1.2 million years ago discovered in Ethiopia

Boudinage in brecciated dolostone rocks of the Panamint Range (Wildrose Area, Death Valley National Park). New research shows that periclase is stronger than bridgmanite in earth's lower mantle, analogous to boudins developing in rigid ("stronger") rocks among less competent ("weaker") rocks. Credit: Jennifer M. Jackson, Caltech

New results reveal surprising behavior of minerals deep in the Earth

Superdeep diamonds that originate hundreds of kilometers beneath Earth’s surface are like time capsules revealing how they were formed, thanks to unique combinations of minerals trapped inside the diamonds. Credit: University of Alberta

‘Superdeep’ diamond deepens our understanding of plate tectonics

Earth, core, mantle

Researchers discover previously unknown mineralogy of the deep Earth

Using Mössbauer spectroscopy, Osaka Metropolitan University scientists investigate the iron ion status of pyroxenes, a major group of rock-forming silicate minerals. Their study revealed that in pyroxene crystals consisting of roughly 50% calcium, the tensor that determines the ratios of iron ions at the Mössbauer spectral peaks is independent of the iron content but dependent on the calcium content. Credit: Shinoda, OMU

Calcium content determines the peak intensity ratio due to iron ions...

A depiction of an asteroid heading toward Earth, with the moon in the background. (Image credit: Juan Gartner via Getty Images)

The largest meteorite impacts on Earth

The diamond from Botswana revealed to the scientists that considerable amounts of water are stored in the rock at a depth of more than 600 kilometres. Photo: Tingting Gu, Gemological Institute of America, New York, NY, USA

An ocean inside Earth? Water hundreds of kilometers down

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