A chemical compound or sedimentary rock type characterized by its chemical composition, possibly related to mineral formation.
From French 'adinole,' itself from Latin/Greek elements, used in 19th-century geology and mineralogy to classify specific rock types.
Adinole is a geological term that tried to describe a specific type of metamorphic rock, but geologists kept changing what they meant by it until the word became useless—a perfect example of how science left behind names that were too confusing.
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