Definition of simpsonite in English:

simpsonite

Pronunciation /ˈsɪmpsənʌɪt/

noun

Mineralogy
  • An aluminium-containing mineral occurring as colourless, yellow, or light-brown crystals.

    Chemical formula: Al₄(Ta, Nb)₃(O, OH, F)₁₄.

Origin

1930s; earliest use found in Smith's Weekly (Sydney). From the name of E. S. Simpson, Australian mineralogist + -ite.