One of the mysteries of the English language finally explained.
A monoclinic arsenide of copper and silver, Cu₂₀AgAs₁₀, occurring in the Krkonose mountains of the northern Czech Republic, which is steel-grey on fresh fracture but becomes almost black on exposure to air.
1950s; earliest use found in American Mineralogist. From German Novákit from the name of Jiří Novák, Czech mineralogist + -it.
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