gadolinite /ˈɡadəlɪnʌɪt 
, ɡəˈdəʊlɪnʌɪt / ▸ noun [mass noun] a rare dark brown or black mineral, consisting of a silicate of iron, beryllium, and rare earths. – ORIGIN early 19th century: named after Johan Gadolin (1760–1852), the Finnish mineralogist who first identified it.
EnglishOxford Dictionary of English
