One of the mysteries of the English language finally explained.
Manganese oxide, MnO, a cubic mineral occurring as translucent green octahedral crystals which blacken on exposure to air.
Late 19th century; earliest use found in Edward Dana (1849–1935), mineralogist and physicist. From Swedish manganosit from mangano- + -sit, probably after mineral names comprising a first element ending in -s + -ite, as German Epidosit epidosite, Globosit globosite, Kyrosit kyrosite: -s- occurs by a similar process of analogy in Spanish morenosita.
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