muromontite
/ˌmjʊəreʊˈmɒntʌɪt/ /ˌmjɔːreʊˈmɒntʌɪt/Mineralogy. Now historical
noun
An uncharacterized silicate of beryllium, iron, and yttrium (perhaps a variety of allanite).
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From German Muromontit from Muromontium, post-classical Latin form of the name of Mauersberg in Saxony, where it was found + German -it.