Definition of melanosiderite in English:

melanosiderite

noun

Mineralogy
  • A silicate of aluminium and ferric iron occurring in black vitreous masses.

Origin

Late 19th century; earliest use found in Josiah Parsons Cooke (1827–1894). From melano- + siderite.

Pronunciation

melanosiderite

/ˌmɛlənəʊˈsɪdərʌɪt/