Definition of marmatite in US English:

marmatite

noun

Mineralogy
  • A ferroan variety of sphalerite.

Origin

Mid 19th century; earliest use found in Thomas Thomson. From German Marmatit from the name of Marmato, a village in western central Colombia, where it was first identified + -it.

Pronunciation

marmatite

/ˈmɑːmətʌɪt/