Definition of michaelite in English:

michaelite

noun

Mineralogy
rare, historical
  • A siliceous mineral now identified as fiorite.

Origin

Early 19th century. From the name of St Michaels (Portuguese São Miguel), the island in the Azores where the mineral occurs + -ite.

Pronunciation

michaelite

/ˈmʌɪkəlʌɪt/