Impressed by the beauty of a metamorphic rock from the Saualpe, Austria, René-Just Haüy (1743–1822) created the name “eclogite” (the chosen rock), which he derived from the Greek word εκλογή (choice). The name was used for the first time in 1822 in the second edition of Haüy’s “Traité de minéralogie”. However, the first “scientific” description dates back to the second half of the 18th century, when Horace-Bénédict de Saussure (1740–1799) mentioned a “beautiful rock that is not described yet” from the Rhône Valley in his famous book “Voyages dans les Alpes”. Eclogite is a metabasic rock dominated by the...

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