neotantalite
/ˌniːə(ʊ)ˈtantəlʌɪt/Mineralogy
noun
A mineral found as yellow octahedra which was formerly thought to be dimorphous with tantalite but is now considered to be a variety of microlite.
Origin
Early 20th century; earliest use found in Mineralogy Magazine. From neo- + tantalite, after French néotantalite.