neptunite
Noun. A black silicate mineral with chemical formula KNa2Li(Fe2+,Mn2+)2Ti2Si8O24.This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.