One of the mysteries of the English language finally explained.
A reddish hydrated silicate of manganese and magnesium.
Late 19th century; earliest use found in American Naturalist. From German Neotesit from ancient Greek νεοτήσιος youthful (on account of the mineral's supposed formation later than other manganese silicates; from νεότης youth + -ήσιος, suffix forming adjectives) + German -it.
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