oellacherite
/əːˈlakərʌɪt/Mineralogy
noun
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.