Definition of nigrescite in English:

nigrescite

noun

Mineralogy
rare
  • An amorphous hydrated silicate of magnesium, ferrous iron, calcium, and aluminium, which is green when first exposed to the air but gradually turns black.

Origin

Late 19th century; earliest use found in Edward Dana (1849–1935), mineralogist and physicist. From German Nigrescit from classical Latin nigrēscere to grow black + German -it.

Pronunciation

nigrescite

/nɪˈɡrɛskʌɪt/