A team of Brazilian researchers discovered the first direct evidence that goethite—the mineral responsible for the brown color of soils—can withstand extreme pressures and temperatures all the way to the planet's interior inside a diamond just 3 millimeters (0. 1 inch) long, within a microscopic ...

Source: [Phys.org](https://phys.org/news/2026-08-ancient-diamond-evidence-mineral-deep.html)

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