Definition of montebrasite in US English:

montebrasite

noun

Mineralogy
  • A triclinic phosphate of lithium, sodium, and aluminium usually occurring as white to greyish-white transparent to translucent crystals.

Origin

Late 19th century; earliest use found in James Nicol (1810–1879), geologist. From French montebrasite from Montebras, the name of a hill in the department of Creuse in central France where the mineral is found + -ite.