molybdite
/məˈlɪbdʌɪt/Mineralogy
noun
Molybdenum trioxide, crystallizing in the orthorhombic system and usually occurring as flat yellow needles and plates forming encrustations.
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From German Molybdit from Molybd- + -it.