Definition of oellacherite in US English:

oellacherite

noun

Mineralogy
  • A white or pink variety of muscovite containing a significant proportion of barium.

Origin

Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From the name of J. Oellacher (b. 1804), Austrian-born Hungarian chemist, who described it + -ite.

Pronunciation

oellacherite

/əːˈlakərʌɪt/