One of the mysteries of the English language finally explained.
A magnesium-containing mineral that is an alteration product of pyrite typically occurring as reddish crystalline masses, often botryoidal or reniform.
Early 19th century; earliest use found in Edinburgh New Philosophical Journal. From German Botryogen from ancient Greek βοτρυο-, combining form (in e.g. βοτρυόδωρος grape-producing) of βότρυς bunch of grapes + -γενής, so called in allusion to the botryoidal form of the mineral.
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