oosite
/ˈəʊəsʌɪt/(also oösite) Mineralogy. Now rare
noun
An aluminosilicate of ferrous iron and alkali metals which is a pseudomorph of pinite.
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From German Oösit from the name of the Oos valley, in Baden-Württemberg, Germany, where the mineral was first found + -it.