Electric Blue: The Secrets of Moroccan Aerinite Finally Unraveled

The story of this extraordinary specimen began in 1980, south of Fès. A British geologist, Anna Grayson, noticed this stone on a roadside stall. While the seller thought he was selling lapis lazuli, the scientist was immediately intrigued by its unique hue and polished faces, characteristics of tectonic fault slips.

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As detailed in the columns of the London Post, the mystery deepened in 1995 when the sample was entrusted to British experts. Faced with the lack of correspondence in the crystallographic databases of the time, the team of researchers first believed they had uncovered a mineral species completely unknown to science.

It took several decades and the evolution of X-ray analysis technologies to unravel the secrets of this extremely complex silicate. It was not until 2004 that its structure was officially determined. Named aerinite in reference to the Greek word meaning "blue sky", the mineral owes its fascinating color to millions of microscopic crystalline fibers interacting with light.

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Now accessible to the general public, this fragment of the Moroccan depths testifies to the immense forces of nature. "It is in a way a fossilized earthquake, which records a tectonically active high-pressure environment," marvels Anna Grayson, recalling that this fundamental science still holds magnificent discoveries.